This astronomical clock is the second oldest in England.

The ruins of this medieval castle on a foggy hill tell the story of a once-mighty empire.

The oldest residential street in Europe also features an optical illusion.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

At this monastery, monks make raw-milk cheese and use excess whey to create methane that powers their hot-water system.

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

This quirky little private museum is home to more than a thousand stones, carved by nature, that resemble human faces.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A tunnel with windows, so you don't miss out on the impressive views.

The last remaining predreadnought battleship in the world has been a museum for nearly a century.

The oldest church in Serbia was also the ecclesiastical seat of the region during the Middle Ages.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

Sleep in a glass pod dangling off a cliff.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This tower was constructed to commemorate the man who helped bring true democracy to the United Kingdom.

Classic game cookery takes center stage at what's widely considered London's oldest restaurant.

This gravestone and its inscription inspired a movement that has spanned generations and saved countless lives.

The oldest candy store in the world has been selling traditional sweets since 1827.

The world's longest outdoor escalator takes visitors to the top of China's largest dam and is also shaped like a dragon.

Where an 11th-century flying monk crash landed after attempting to take to the skies.