This nature center has one of the largest collections of native raptors in the Pacific Northwest.

The longest and widest floating bridge in the world.

Where NASA's satellites and rovers phone home.

The first mosque in the world to receive electricity.

Hopeless romantics will swoon over the sweet story behind this bright and colorful home.

Former headquarters of the KGB.

The tallest hotel in Europe.

Moscow's imposing monument to the Space Age.

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

Stalinist skyscraper built with help of cryotechnology.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The wooden airship was the largest flying boat ever built.

10,000 flowered plants bloom in the City of Roses.

The park preserves a single, rare species of carnivorous plant that spells doom for unsuspecting insects.

Tiny horses tethered to antique rings are scattered around the city.

A former Nazi lookout tower with a magnificent view of the Rhineland.

The haunting ruins of a military fortress turned astronomical observatory sit on a Sarajevo mountaintop.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

This charmingly homemade amusement park has been growing for 40 years.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

This sandstone mansion was the home of two of Oregon's most important pioneers.

An extraordinary mixture of natural beauty and man-made phenomena.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

A walk through the historic city center, under the streets of Seattle.