The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

A wacky, UFO-shaped house in a suburban neighborhood.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

Fantastic collection celebrating the final send-off.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

These mysterious petroglyphs in Vermont reflect a troubled history in the treatment of Native American culture.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

The highest point on the island known for buildings that touch the sky.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Parts of the civil rights movement unfolded in this historic eatery, helmed by the "Queen of Creole Cuisine."

A Cajun-style Christmas on the river also involves sky-high pyres and explosives.

An otherworldly musical haven in The Big Easy.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

This Art Deco airport was once deemed “the air hub of the Americas.”

This museum chronicles the history of a leprosy quarantine hospital that then became a refuge.

If New Orleans is the birthplace of the "cocktail," why does their own museum of cocktail memorabilia beg to differ?

Made of giant chains and hung with shackles, this iron cross honors those unknowns who perished under American slavery.

This bar named after the world's first mixed cocktail was home to one of New Orleans' most notorious politicians.

A 19th-century shrine covered with prosthetic body parts as votive offerings.