The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

Largest Roman Catholic church in North America.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

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

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Home to items never before seen by the public.

The United States Capitol's former columns still stand.

Giftshop catering to cryptozoologists and anyone with a sense of humor.