A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

A massive Montreal stadium that has seen nothing but trouble since its inception.

Every year, the colorful murals of Montreal get a complete makeover.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Giant marble phalluses on the sacred island of antiquity.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Where commuters walk through remnants of an ancient Greek necropolis.

Legend says this sacred tree was a gift from goddess Athena.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

An eerie reminder to the horrors of World War II.

Peace Park and the Atomic Bomb Dome.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Devoted Buddhists can earn enlightenment in the next life by crawling through this symbolic nostril.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

The 10,000 Torii shrine.

Go through the looking glass in Tokyo's Wonderland-themed shop.

A magical place that lets you play in and explore the world of Studio Ghibli.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

The fairy tale castle of the "fairy-tale king."

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.