This elaborate High Victorian Gothic structure is one of the world's few 16-sided buildings.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

A small museum displays some of the artifacts discovered during a subway station renovation.

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

This enigmatic Roman tower lurks just outside Belmonte.

This Roman underground canal was the longest tunnel ever built until the late 19th-century.

This historic electric train has operated with regularity since the early 1900s.

Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.

This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

The final resting place for a wealthy Roman family, this tomb might be the best preserved of its kind outside Italy.

This beautiful Romanesque church preserves stunning medieval frescoes and the excavations of a Roman market town.

One of the most exquisite Lycian hilltop citadels in Turkey.

This open-air, narrow-gauge railway museum pays homage to the region's transportation history.

This enormous sinkhole hides a secret world created from divine wrath.

This 1st-century CE Roman bath sits under a carpark.

This 200-meter-high waterfall marks the site of Achilles’s immortal baptism at the mouth of the River Styx.

For decades, vendors have sold clothes once worn by American soldiers who stormed Italy in the 1940s.

A burial vault located under Tiber Island in the middle of the Italian capital.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

This rare surviving broch is one of Scotland's most impressive Bronze Age structures.

This Roman theater was crafted into the local tuff rock and was rediscovered during the 19th-century.

This ancient settlement contains some of the largest earthen mounds in North America.

This lake was sacred to the Sabine people who constructed a temple here on a floating island.

This natural "sea of stones" was once used by the Romans as a quarry.