This Alaska library may be the only one in the country that allows you to check out pieces of taxidermy.

These eerie outliers of the lightning bug family glow a mysterious blue color.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

Experience a charming 1930's version of "infotainment."

This controversial depiction of the "Founder of California" looks as though it was sculpted from mashed potatoes.

An underground city of salt.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

The world's second largest salt mine, said to have been discovered by Alexander the Great's horse.

Cathedral carved out of salt, located a mile below the earth's surface.

Home of what was the largest hydraulic mine in the world, producing gold and the first diamonds in the U.S.

What was once the largest mine in North America has left behind a hollow hill filled with bright blue waters.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

One of the few surviving "Wigwam"-themed motels.

The museum moved on, but the diorama remain.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

Low tide reveals 8,000-year-old rock carvings in Southern Alaska.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

Ruins of a 10th century church tucked away deep in a botanical garden.

Pompeii's less famous neighbor is still revealing her secrets.

A colossal sculptural lion built by the same man who designed the Statue of Liberty.