Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

The ornate structure is part of a building boasting more marble than the Vatican.

This ancient Roman arch misled treasure hunters for centuries.

This church carved into the rocks is full of enchanting stone statues.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

In this truly magical place, rent hasn't been raised since the year 1520.

The commemorative stone column conceals a secret laboratory.

This single-track road rewards brave drivers with stunning Scottish scenery.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

This riverside restaurant has been serving customers since 1146.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

The elegant manor house where Kaiser Wilhelm II lived in exile after World War I.

This magnificent 18th-century hall consists of a maze of nearly a thousand interconnected passages.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

These medieval funerary monuments are now home to a colony of critically endangered vultures.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

A little-known ruin with a convoluted history and a fascinating latrine drainage system.

This pair of running lions engraved on animal bone is one of the earliest artistic depictions of big cats.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.