The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

The unbelievably opulent home built for an infamous newspaperman.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

A massive volcanic plug is now a protected area that hosts a number of bird species.

A hotel and restaurant serving as the mecca of kitsch.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

America's most famous piece of self-built architecture.

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

On a quiet suburban street stands a peculiarly decorated house covered in mosaics.

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

This temple, built by an eccentric religious leader before his death, sits guarded and in ruins.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Though tiki culture has gone in and out of fashion, the Tonga Hut has always been flying the flag in Los Angeles.

Scale replica of China's ancient terracotta tomb warriors and Forbidden City are the side project of an eccentric millionaire.

An unrealized Taoist palace left abandoned in a Houston suburb.

A mysterious castle built as a monument to lost love.

The highest point in Texas is capped by a big silver pyramid.

A six-story-tall golden pyramid, surrounded by a moat.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

The massive Roman arch in New Hampshire that was meant to be a tomb.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.

This lakeside tower is the third attempt at getting a tourist destination to stick on the spot.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

A vast city of the dead, where the deceased outnumber the living by more than a million.