The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An architect's childhood fantasy treehouse made real.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

"Mock all and sundry things, but leave the saints alone."

The Boston square dedicated to the dark poet who was born nearby.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

World's largest herd of white deer populate a former U.S. Army depot.

The library of every book lover's dreams.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

Pluto is still considered a planet in Ithaca, New York.