This secret Swiss fortress is disguised as a harmless pink house, complete with fake windows.

Four hundred granite steps were built into this massive rock by the National Park Service.

Quite simply the largest tree in the world (by volume).

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

The liveliest ghost town in the state.

This impressive tunnel was dug entirely by hand over the course of 36 years.

Thousands of turbines whir at the origin of North American wind power.

One of the ghostly stops along Route 66.

The ghost town that ended up on Ebay.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

Megachurch turned Catholic church comprised of 10,000 glass panes.

A military vehicle collection, showcasing how war transportation advanced from horse drawn artillery to self propelled cannons.

Arcadia is home to a haven for nature geeks and 80s TV lovers alike.

Abandoned bridge hidden deep in the San Gabriel Mountains.

A living museum dedicated to the legendary woodworker and his soulful furniture.

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

This graveyard is the eternal home of the residents of a vanished California town.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.