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.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

One person's lost luggage is another person's treasure.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

More than 7,000 gallons of water pour over these cascading red quartzite waterfalls every second.

A wall of chewing gum moonlights as collective art.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

Yo, Adrian!

Dr Barnes' $25 billion private collection of art and arboretum.

This elaborate towering structure was once famed for its revolutionary height.

A curious building honoring past and current members of a historic musical comedy troupe.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

The last standing puppet theater on Long Island.

This 19th-century Hamptons windmill was once home to modernist painter Agnes Pelton.

A mysterious air force base built to resemble a Long Island fishing village.