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

San Francisco's newly reopened hands-on science museum.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

A winding path built in secret on the edge of the continent.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A huge musical instrument played by the ocean.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Building this tragically pointless stone barrier cost the lives of the prisoners made to build it.

In this pristine Ecuadorian hippie town, residents remain active well into their eighties and nineties.

Since the 1700s, this old barrel has acted as a post box that relies on the kindness of travelers.

This Ecuadorian cemetery is home to a jaw-dropping topiary wonderland.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

Massive volcano in the Andes is the farthest point from earth's center.

A turquoise lake within a volcanic crater.

Ecuador's largest Incan ruins show evidence of sophisticated irrigation and diplomacy among the ancient builders.

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

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

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

Mexico's astounding mummy museum with "the world's smallest mummy."

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

Guatemalan womanizer, venerated during Holy Week.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.