A metal ring in the middle of the road marks the exact spot where the Soviet satellite crash-landed in 1962.

Gambling, boozing, and yodeling animals cover the walls of this dive bar cum natural history museum.

The center of the only hemisphere that awards visitors with a commemorative coin.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

Endless rows of boxes of paper records line the hallways of the archaic federal facility where guns are traced.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

America's post-nuclear-attack chambers of Congress.

Literal "money laundering."

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

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

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

Where the U.S. government kept its actual treasure, before Fort Knox.

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

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

A haunting tribute to pioneering photographer Clover Adams.

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.

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

Home to items never before seen by the public.

The United States Capitol's former columns still stand.

An electrifying collection of gadgets and literature from the 16th through 20th centuries.

This gold-winged spire celebrates the first true flight around the world.

A rare tour of a commercial jet assembly plant, held inside one of the largest buildings in the world.

A bust of the first president welcomes visitors to the only town in America called George, Washington.