The world's largest dead polar bear, immortalized by taxidermy and Hunter S. Thompson.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Home to the deepest rift anywhere on Earth.

Supposedly Satanic numbers adorn this preserved submarine sail.

This museum glorifies the humble potato.

A museum dedicated to the history and art of staying clean.

Dig for your own trilobites in this goldmine of invertebrates.

Behind these delicious arepas lies a true New York success story.

Ornate "Renaissance Revival" style building.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

The home of aviation trailblazers, in a remote corner of the big city.

Brooklyn's most iconic restaurant, resurrected.

Ride the subways of yesteryear.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

Compensation for the destruction of a historic shipyard.

The factory that helped produce a dominant form of lighting before Thomas Edison.

Once home to the country's most gargantuan ships, this graving dock now waits for people to buy furniture.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

A historic arena where the Beatles played their first concert in the U.S.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Perhaps the most scandalous statue of America's first president.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.