Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

Go inside to really appreciate this 500-year-old technological masterpiece.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

An old department store turned Nazi prison turned artist commune.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

It's just another skyscraper, but it's shaped like '90s cell phone.

What was once a unique system of urban elevators is turning into a mechanical ruin.

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

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

The only castle in North America to ever house European sovereigns.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

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

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

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

Every equinox this Maya pyramid puts on a spooky ancient light show.

On this tiny spot of land in the middle of Lake Titicaca the only ones who do the knitting are the men.

Pre-Incan aqueduct amidst a stone forest in Peru.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

These giant mummies are set ominously into a Peruvian cliffside and topped with real human skulls.

An Archaeological Wonder of Peru, and the largest stone ruin site in the New World.