Brazil's only museum dedicated to the art and evolution of tattoos.

This somber statue remembers the enslaved women who were forced to nurse their owners' babies.

The crypts are so large they're basically their own underground church.

An enigmatic mural hiding in plain sight in one of São Paulo's busiest metro stations.

This Argentinian hedge maze is an intricate tribute to a famous surrealist author.

This ultra-modern burial building would have stacked the dead like a giant filing cabinet.

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

Sleep amongst an abundance of art from the modern era.

A massive mausoleum towers over the gravestones in a 19th-century Italian "model village."

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

The underground sanctuary of a mysterious ancient Roman religious cult contains an exquisite traditional fresco.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

A magnificent Neogothic tomb hides within this Italian fairytale-like forest.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Romans built the world's tallest artificial waterfall in 271 BC.

The marshy karst plain has reclaimed this beautiful 17th-century church.

Preserved "bog person" that is over 2,000 years old.

Frida Kahlo's childhood home, now a museum of her life and works.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

The world's fifth tallest waterfall is a spectacular silver chute of water that cuts through the cloud forest in northern Peru.