One of the only spherical 19th century gas containers left today.

This historic stone bridge has an entire neighborhood clinging to its sides.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

A Neolithic celestial calendar standing in a nondescript wheat field.

Is this statue at Naumberg Cathedral the fairest of them all?

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A tiny church on a man-made island in the Adriatic.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Steadily reminding Czechia of its past.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

Two gilded cherubs perched on a church bell tower have been reminding visitors of the finitude of life since 1760.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

Countless grotesque faces stare out from this eerie Prague art wall.

The reconstruction of this prominent building fulfilled a long-written command.

The world's second-largest sundial, made entirely out of stone.

The evocative ruins of a 1,000-year-old hill fort lie within a popular tiger reserve.

Long tunnels run under the ancient chariot racing circuit to the tower.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

A hidden three-foot-wide house separates these two regal churches.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”