This conical hill was built as a testing ground for an engineer known as the Glider King.

A 12th-century fortress containing some of Berlin's oldest buildings.

A collection of abandoned typographic signs from Berlin and beyond.

Art and a pun, all in one.

The oldest Methodist church in the United States has been spreading the good news for over two centuries.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

A uniquely lettered street sign marks the corner where the iconic word game was invented.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

A celebration of capitalism in Midtown.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A dilapidated dock tells the story of Titanic's missed arrival.

Inside this casino, visitors are treated to slot machines and a rare German Christmas pyramid.

Unlike most arches, this geological oddity formed in a volcanic dike.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

Even in death, he's still your huckleberry.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.