The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

CDMX's home for the world's culinary delights.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

A museum in the former home of Marxist revolutionary Leon Trotsky.

This beautifully deceptive waterfall is something far different from what it appears to be.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

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

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

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

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

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

The broken skateboards that became a poignant memorial to a murdered skater.

Giant, friendly pelicans in Central London, the most unlikely of places.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

At a museum of everyday objects, it is the act of collecting that is really on display.

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

66,000 pieces of art, donated by one of the world's richest men.

The only castle in North America to ever house European sovereigns.

Part bookstore, part café, and part forest.