Half-hidden by grassy slopes, this striking Spanish colonial fort is now a museum of underwater archaeology.

A bright, colorful telling of the history of Mexico's youngest state.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

Iconic red and white plaques show the creative names invented to navigate the city streets.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

Considered by many to be one of the most dangerous highways in Alaska.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

A bizarre house filled with an astounding array of collections.