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.

At 207 feet, one of the world's longest continuous escalators.

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

This iconic science fiction house still looks like something from the future.

The site of the climactic scene from the classic horror film is now a historic landmark.

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

Daily lunch spot for many of Washington, D.C.'s cab drivers.

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

The "lovely red Vega" of the legendary record-settling pilot.

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

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

The most decorated dog of World War I is preserved in the Smithsonian.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

The house where John Wilkes Booth conspired with his co-conspirators.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

Like something out of a bad acid trip, this Ukraine hallway has been covered in hallucinatory phantasmagoria.

This historic mansion was built as a symbol of love between a husband and wife.

This Scottish manor house is a lush relic from the life of a literary great.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

Man-made geyser that rises to the exact height of the Gateway Arch.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.