Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

A vast necropolis where you'll find the elaborate mausoleums of Argentinian tango stars.

A chance to sleep among the firs and pines of the Oregon forest.

A whimsical village of unique treehouses resides in a Washington forest.

A 63-foot-tall swinging ball hypnotizes passersby, and proves to any remaining doubters that the Earth is spinning.

This enchanting rainforest hotel looks as though it grew from the forest itself.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

A Moroccan getaway in the mountain range that plays the Himalayas' stunt double.

A series of mosaics in Mexico City's Historic Center celebrate the Basque Country's "eighth province"—its diaspora.

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

One of the world's largest telescopes, stares into the night sky with two huge mirrors.

An off-the-beaten path cave with an underground lake.

Two identical statues by Fernando Botero, one blown to pieces in a terrorist bombing, the other donated as a gift for peace.

Home to 23 voluptuous and instantly lovable sculptures by one of Latin America's most celebrated artists.

Beauty and history abound in this remote West Texas canyon.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Behind the Cowboy Hall of Fame is a burial ground for good horses and a famed rodeo bull.

An old spiral fire escape dangles above a public courtyard in Midtown Oklahoma City.

Celebrate the history of the rich and truly misunderstood relationship between man and pigeon.