World's largest collection of serial killer artwork and other macabre exhibits.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The most visited, and possibly most controversial, museum in Germany.

Started as a kitchen garden, now the second largest botanical garden in the world.

An eerie, derelict amusement park in Berlin.

This museum houses an imposing skeleton army comprised of creatures great and small.

A museum of carnival attractions where you are invited to ride the rides.

These termites have an large and deadly abode—impressive by day, dazzling by night.

Part of one of the largest flooded cavities on the planet, and littered with prehistoric animal bones.

You feel like you're in a forest, but you're actually walking amidst the branches and trunks of a single giant tree.

After millennia of erosion by sand and churning water this Brazilian valley now looks like a lunar fantasy.

Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

An ancient burial ground believed to have been used for ritual sacrifice.

A 15th-century granary that played the role of futuristic slave quarters in the world of 'Star Wars.'

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

The original movie set for the home of 'Star Wars' hero Luke Skywalker.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

This 7th-century monastery was sacked by Saladin.

Giant pigeon houses packed into city streets in Egypt.

A strange aquarium with stuffed fish, and almost no water for them to swim in.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

It might not be the prettiest pyramid in Egypt, but it may be the muddiest.

Part shoe store, part sociopolitical art gallery, part zoo.