The charmingly disheveled clock tower of Tbilisi's puppet theater.

Ancient rock-hewn town that witnessed key events of Georgian history.

Underground monastery and fortress.

Small church on top of a huge rock column.

The first skyscraper to include a Ferris wheel built into the facade.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

Ancient snack bar of the Roman Empire re-opened.

One of the largest caves in the world open to the public.

The location of the last witch trials of Italy, known as "The Salem of Europe."

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Stalactites and stalagmites in a beautifully lit cave.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

The highest waterfall in Italy is only "turned on" five times a year.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Bell tower juts out from a village buried under a lake.

An Italian hillside ghost town.

This Italian foot path winds through the mountains via 52 individual tunnels.

Abandoned medieval hill town.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

This Italian dam is covered in salt-hungry goats who manage to scale its almost vertical face.