A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

Obscure Freemasons still live in D.C.’s largest private residence.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

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

A painfully obvious spy house sits right across the street from the Russian Embassy.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

This stately clubhouse has showcased German-American culture for over a century.

This library and museum is dedicated to the life and literature of the Indianapolis native author.

The rustic cabin-like decor of this Arts and Crafts-style church reflects the love of nature central to its little-known theology.

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.

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

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

The television series' iconic giant foot was borrowed from this classical painting.

Rebuilt remains of a temple to Roman god Mithras.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Tucked away between two 19th-century buildings, this small shop specializes in the macabre.

The famous greeting card maker owns a collection of paintings by the famed surrealist.

A gem in the small Missouri town where Winston Churchill coined the term "Iron Curtain" and effectively began the Cold War.