Diego Rivera's massive tiled fountain and failed infrastructure project.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

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

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

Part bookstore, part café, and part forest.

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

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

The hellish conditions of this abandoned mine that snakes beneath the Pacific Ocean gave it its diabolic name.

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

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

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

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This stunning mass of ice spans 121 square miles and is still growing.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

Once swallowed by flood waters, this village has emerged as an eerie shadow of its former self.

After millennia of erosion by sand and churning water this Brazilian valley now looks like a lunar fantasy.

A valley of unique erosion patterns lends to a view like nothing on Earth.