Football field-sized microalgae production tanks on the Hawaiian coast create a stunning view from space.

The arch that celebrated the completion of the Lincoln and Victory highways.

The smallest country in the world.

This historic estate on the east shore of Lake Tahoe was home to an eccentric millionaire (and his pet elephant, Mingo).

A relic from a forgotten bakery chain still spins atop a diner.

The most unique castle in all of Southern California, entirely constructed from repurposed materials.

This strangely vacant Western amusement seems to be an empty tribute to residents of Lucerne Valley.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

Decommissioned experimental solar facilities that pioneered solar energy technology.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

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

This former lieutenant governor's home is brimming with curiosities.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.