The world's first permanently occupied mountain-top observatory continues to report on the stars.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Three hundred years of preserved Spanish colonial history in San Antonio.

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

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

Portlandia is the second-largest copper repoussé statue in the United States.

The magic's in the hole!

Gargantuan home of Russian science.

Former headquarters of the KGB.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Moscow's imposing monument to the Space Age.

World's largest bell sits on the grounds of the Kremlin in Moscow.

The tallest hotel in Europe.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

The stoutest tree in the world.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

Sloth rehabilitation center in the jungle of Costa Rica.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Quite simply the largest tree in the world (by volume).

A 1920s speakeasy that had rum runners racing up and down the shores of California.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.