Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

The Guardian of Tallinn.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

"There's nothing there," and other lies the KGB told us.

An alien church provides much needed silence in the midst of a Finland shopping center.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

This church also serves as a lighthouse complete with a beacon.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A subterranean house of worship carved right out of the bedrock.

As its grandiose name implies, this wooden dome is unsurpassed in size.

The statues honor the state transportation employees who've died while performing their work-related duties.

A collection of huge Pre-Colombian structures in Alabama.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

This ancient settlement contains some of the largest earthen mounds in North America.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

A high-octane shrine to the greatest Texans who ever lived.

Continuing the tradition of the dime museum in style.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

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

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.