This is the house that spite built.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Famously misunderstood wonder of the ancient world

Op-art architecture designed for happiness.

The beautiful baroque library of the Hapsburg empire.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

A Gothic-style abode built to accommodate the church's three resident peacocks.

Hiroshima survivor on Riverside Drive.

The 28-foot granite map plots the locations of 40 theaters in New York City.

This was one of the first (and last) university-built and operated nuclear reactors.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

The most confusing clock in New York.

The Tallahassee Airport serves over half a million passengers a year and is home to some permanent residents too.

Over 120,000 curious objects that have shaped our modern world.

Where monkeys run wild and the humans are caged.