High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

World's largest collection of serial killer artwork and other macabre exhibits.

The biggest museum dedicated to insects in North America, one of the largest in the world.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

This one-window stand has been home to a giant vat of slowly simmering meats and an array of unique tacos for almost 50 years.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

Also known as the Founding Church of Scientology.

A much-maligned monument to teetotalism.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

The national park was once a plantation estate.

It was once the base for a series of domestic terror attacks.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A derelict bit of transportation infrastructure hidden in the woods.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.