A tongue-in-cheek arcade where the games are based on everyday life.

London's old-school healing garden.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Eighty million natural history specimens call this gargantuan museum home.

The anatomical-pathological collection of a man who changed surgery.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

A kaleidoscopic warehouse-maze of handmade neon signs.

This small Spanish village is home to dozens of public paintings meant to trick the eye.

A lush indoor jungle fills this bustling Madrid transportation hub.

Stockholm's deepest subway station is also a stunning ecological wonder.

A stretch of land where the sour-sweet vegetable is cloaked in darkness and grows so fast you can hear it crack, squeak, and pop.

A museum befitting the city responsible for supplying the majority of the world's LSD.

Natural saunas fed by volcanic heat.

A ruined Maya city that suffered a years-long case of mistaken identity.

One of the world's largest pyramids stands within El Mirador, the "lost city of the Maya."

A collection of heirloom roses tucked in a spectacularly beautiful botanical garden on Lake Atitlan.

An impressive century-old, to-scale topographical map of Guatemala.

This orchid sanctuary protects countless varieties of the flower, from the huge to the microscopic.

Experiencing Guatemala's sensory-exploding church is a blunt reminder of European influence.

Giant kites are flown during this Day of the Dead celebration in Guatemala.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

One of the world’s most colorful cemeteries, where each pigment is symbolic.

Volcanically heated hot springs.

Hidden deep in the Guatemalan jungle is a turquoise paradise of natural pools, caves, and waterfalls.