The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Most famous work of one of Frank Lloyd Wright's sons.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A giant open-air sculpture made of over 200 full-sized boats.

Thousands of artifacts relating to human sexuality, including the world's largest sex bike.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A blacklight mini-golf fever dream pays tribute to the iconic rock band.

An 1870s ranch for pioneers, rodeo stars, and divorcees was abandoned and left for dead, until the city reopened it for exploration.