This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

This forgotten chalk mine was reopened thanks to a massive effort from the local community.

Overlooking the seaside town of Margate stands a tribute to an artist's lover.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

A vast archive of cultural artifacts collected from numerous expeditions across Africa and Asia.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

As part of an 800-year-old tradition, a man parades through town covered in a suit made out of spiky burrs.

This mural condenses 96 miles of one of Scotland's best-known trails into a unique art display.

This astronomically-aligned stone circle was the first of its kind to be built in Great Britain after a 3,000-year hiatus.

This poured-concrete water reservoir is a gem of modernist architecture well-hidden in a city forest.

An abandoned faux-pub made famous by a Guinness commercial.

This small Irish village suffered the greatest loss of life when the Titanic sank.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

The Flatiron Building's storied West Coast cousin is a lot more into religion.

A massive ultra-modern church presents a science-fiction view of Catholicism's inclusive future.

This restaurant offers the original California cuisine.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

Not far from a popular beach, an unfinished, abandoned mansion for Bulgaria's last communist dictator.

A closer look at this somewhat faded hotel by the Corinth Canal reveals the architectural undertones of a genius.