This stone once marked the boundaries of Liverpool's medieval markets.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

This bronze statue was dedicated to a 1966 Beatles hit.

A fortified city, home to a remaining population of five families

God's Saharan sandbox of wrath.

One of the most spectacular canyons in the world.

Mosaics, storks, and brothels—this ancient city has it all.

The oldest known university in the world is in Fez, Morocco.

Traditional 11th-century outdoor tannery.

The other side is actually green.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

Murals of the wild parties once held on the frozen River Thames.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

A plaque marks the underground site of one of London's "lost rivers."

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

A 125-meter long "tribute to the Brazilian people."

You feel like you're in a forest, but you're actually walking amidst the branches and trunks of a single giant tree.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

The Great Fire of London and the regulation of one-way streets both started in this alley.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

This giant sculpture made of trash is a critique of society's wastefulness.