Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This church also serves as a lighthouse complete with a beacon.

A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

The last permanent exhibit dedicated to the Soviet leader.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Gargoyle head that brings good luck.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Baroque celebration of the end of the Great Plague of Vienna.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

Over time, this castle grew to encompass the entire island.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

The hallucinogenic center of the ancient world.

Hideout of thieves, monks, and goat-footed gods.