“They don’t build them like they used to.” That familiar lament rings true when we glance at the sleek glass‑and‑steel skyline of modern cities—without vigilant maintenance, even today’s marvels would crumble. Yet some ancient creators, armed only with stone, timber, and early concrete, fashioned edifices that have outlasted empires and still serve practical purposes. In this roundup we celebrate ten amazing ancient structures that continue to function in the modern world.
10 Amazing Ancient Highlights
10 Proserpina Dam
Dam failures dominate headlines these days, from sabotage to aging infrastructure, and many 20th‑century reservoirs are already showing distress. Imagine a barrier that has survived nearly two millennia and still channels water for human needs.
Constructed in the 2nd century AD by Roman engineers, Spain’s Proserpina Dam was built to supply the city of Augusta Emerita—today’s Mérida—with a reliable water source. The 12‑metre‑high, 400‑metre‑long structure combines an earth‑filled core, faced with bricks, and reinforced by a series of sturdy buttresses. Its reservoir feeds the Milagros aqueduct, whose towering arches still dominate the landscape.
Although the dam no longer provides municipal drinking water, it remains operational. Local farmers still open and close its inlets to irrigate crops, employing the same basic mechanisms the Romans devised nearly 2,000 years ago.
9 Arles Amphitheatre
The Romans loved to flaunt their engineering prowess, erecting aqueducts, temples, and theatres to showcase the benefits of empire. In Gaul, the Arles Amphitheatre stood as a dazzling testament to Roman grandeur.
Erected in 90 AD, the arena could accommodate 20,000 spectators within its 120 arches that encircle an oval performance space. For four centuries, it hosted an eclectic mix of events—from animal hunts to theatrical spectacles and gladiatorial combat—offering a “view from both sides” as its name suggests.
When the Western Empire fell, the stone walls transformed into a fortified settlement, with 200 houses, churches, and a town square sprouting inside. After a 19th‑century clearance, the arena was restored to its original form and now stages plays, concerts, and even bullfights, keeping the ancient spirit alive.
8 Theatre of Marcellus
While Arles’ arena was fully restored, Rome’s Theatre of Marcellus took a different path, evolving from a grand performance venue into a luxurious residential complex.
Completed in 13 BC, the theatre was the largest of its era, seating nearly 20,000 citizens. Named for Augustus’ nephew, it rivaled the later Colosseum in prestige. Over time, the structure fell into disrepair, and stones were repurposed for other projects, such as the Bridge of Cestius.
Nevertheless, enough of the edifice survived to become a fortified stronghold and, later, a palatial residence for the affluent Orsini family. Today, the former aristocratic apartments still house residents, their arches echoing the applause that once filled the Roman auditorium.
7 Theatre of Epidaurus
Roman wooden theatres were notoriously fragile—one collapse at Fidenae in 27 AD claimed around 20,000 lives. The Greeks, however, perfected a safer design by carving theatres into natural slopes.
Built in the 4th century BC by architect Polykleitos the Younger, the Theatre of Epidaurus sat within a sanctuary dedicated to Asclepius, the god of healing. Its acoustics were so refined that a whisper from the stage could be heard clearly in the farthest seat, a feat that still astonishes modern audiences.
Buried for centuries, the site was excavated in 1881 and restored. Today, it serves as a premier venue for music and drama, its legendary sound quality drawing crowds from around the globe.
6 Diocletian’s Palace
Emperor Diocletian is the only Roman ruler to voluntarily abdicate, retreating to a self‑constructed palace in modern‑day Split, Croatia, in 305 AD. He sought a quiet life of cabbage farming, far from the intrigues of imperial politics.
The palace was more than a retirement villa; massive walls enclosed living quarters, a barracks, and defensive installations. These fortifications proved vital when Slavic invaders arrived in the 7th century, prompting locals to seek refuge within the stronghold.
Over time, the palace became the nucleus of a burgeoning town, eventually evolving into the historic old city of Split. Today, its ancient walls enclose a vibrant mix of homes, shops, and churches, seamlessly blending antiquity with contemporary life.
5 Maymand Caves
Living in caves might sound primitive, but for millennia they offered optimal shelter—natural insulation against extreme temperatures and defensible entrances that could be sealed quickly.
In Iran’s Maymand valley, evidence of human occupation dates back over 10,000 years. While the surrounding area boasts ancient pottery and engravings, the true marvel lies in the 300 hand‑carved caves that have been continuously inhabited for roughly 3,000 years.
These dwellings are stacked like steps up a hillside, each comprising a single room with a central stove for heating and cooking. Legends claim the caves were hewn using only hard stone flakes, a testament to the ingenuity of their early builders.
4 Mundeshwari Temple
If a structure remains central to a community’s spiritual life, its survival chances soar. The Mundeshwari Temple in Kaura, India, is revered as the country’s oldest functional Hindu shrine, dating to around 600 AD.
Octagonal in shape, the stone sanctuary is dedicated to the four‑faced aspect of Shiva, though its name hints at the mythic asura Munda. Surrounding the temple are scattered fragments of a once larger complex, currently under scholarly study to reconstruct its original layout.
The temple still hosts worshippers, its interior blackened by centuries of incense smoke and torchlight. Recent restoration efforts have cleaned the walls, yet the building continues to thrive as a vibrant place of devotion.
3 Castel Sant’Angelo
Few ancient structures have enjoyed as many reincarnations as Rome’s Castel Sant’Angelo, which began its life as a mausoleum for Emperor Hadrian.
Hadrian, famed for the eponymous wall in Britain and the reconstruction of the Pantheon, commissioned a towering cylindrical tomb for his ashes. Completed by his successor, the edifice later became part of Rome’s defensive walls under Emperor Aurelian.
Over the centuries, the building served as a papal fortress, a prison, and finally a museum showcasing Roman and Christian art. Its layered history makes it a unique blend of memorial, stronghold, and cultural venue.
2 Horyu‑ji
Wooden structures are notoriously vulnerable to fire, decay, and war, yet the pagoda at Hōryū‑ji in Japan has defied the odds to become the world’s oldest surviving functional wooden building.
At its heart stands a 35‑metre central pillar fashioned from a tree felled in 594 AD. Although a fire in 670 AD damaged parts of the temple, the surviving buildings were rebuilt in the 7th century and have endured countless earthquakes and conflicts.
Today, Hōryū‑ji remains an active place of worship, offering a living glimpse into early Buddhist architecture as it first arrived from China to Japan.
1 Tower of Hercules Lighthouse
Perched on a rugged promontory along Spain’s northern coast, the Tower of Hercules has guided mariners for nearly two millennia, making it the oldest functioning lighthouse on Earth.
Originally named “Farum Brigantium,” the Roman beacon was modeled after the famed Pharos of Alexandria. Inscribed at its base, a dedication credits architect Gaius Sevius Lupus and honors the god Mars. The current 55‑metre tower includes the original 34‑metre Roman core, with two additional levels added in the 18th century.
Legend claims Hercules erected the tower after slaying the giant Geryon, a tale immortalized on the city of A Coruña’s coat of arms, which depicts the lighthouse atop the giant’s skull. The beacon continues to flash its warning light, safeguarding ships just as it did in antiquity.