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

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

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

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

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

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

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

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

Extraordinary sculpture garden created by an eccentric English poet.

These azure waters were thought to lead to the Mayan Underworld.

An Aztec snake god has taken the material form of an apartment complex.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The only theatre in the world constructed specifically for sound movement.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

A psychedelic labyrinth on the San Francisco bay.

A speck of nature and art in one of San Francisco’s most notorious neighborhoods.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.