Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

A monument in the Belarusian city of Polotsk claims to mark the exact midpoint of the European continent.

A mysterious echo seems to defy the laws of acoustics.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

See massive fossils that are over 200 million years old in northeastern Arizona.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

Dig for your own trilobites in this goldmine of invertebrates.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Antique automobiles, phonographs, organs, and farm equipment.