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

Machismo turned on its head: the lady's hand goes to the dude with the bigger brain.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

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

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

An Austrian house of bones filled with hundreds of intricately painted skulls.

This "mathematical tower" was an observatory, early skyscraper, and place to reflect on all of nature and the cosmos.

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

An Aztec snake god has taken the material form of an apartment complex.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Highly unusual subterranean stupa and adjacent cave monastery.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

An abandoned Indian-inspired mansion.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

Walk through a fairytale in Tuscany.

Caves famous for the dragon-slaying saint who lived there.

Vast network of air raid tunnels beneath Lombardy's capital.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

The giant skeleton sculpture is surprisingly well-traveled.

An ancient artistic garden parlor full of hidden water wonders.

An unusual house built using an iso-elastic membrane.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

The rocks in this arid basin leave trails of movement behind them.

The bomb-ravaged remains of of a colossal Neptune.