The world's largest model of our planetary system.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

One man's fulfilled dream of living on an artificial island made of recycled plastic bottles.

Shocking dioramas of human torture, meant to promote human rights awareness.

A sapling of the legendary tree where conquistador Hernán Cortés sat and wept after an Aztec uprising.

A lake at the bottom of the ocean.

Stained glass windows bathe this botanical garden in cosmic light.

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

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

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.

The winter home of millions of migrating monarch butterflies.

This fantastical house shaped like a seashell brings aquatic design to architecture.

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

Extraordinary sculpture garden created by an eccentric English poet.

A gargantuan crystal kingdom.

A deeply beautiful 15th-century stepwell with a tragic story.

These particularly resplendent rodents are the state animal of Maharashtra.

A rare cluster of alien-like plants grows along a dusty highway.

An enchanting rocky island of scraggly baobabs surrounded by an ancient sea and sprawling salt pans.

Wondrous stalactites house thousands of bats in these African caves.

Zambia's smallest national park is home to one of the world's largest annual mammal migrations.