Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Flamboyant architecture from the turn of 20th century.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

Relics from an era long gone, sit idle outside this Estonian museum.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

A unique sculpture calls the outside of this steakhouse home.

The second-largest collection of runic calendar staffs in Sweden.

The second oldest anatomical theater is housed in a museum of curiosities.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

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

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

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

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

Salt is slowly eating away this abandoned saltworks town in the desert.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A tunnel with windows, so you don't miss out on the impressive views.

A kitschy stop on the way to Zion National Park.

The unusual patterns in this rock formation result from two distinct modes of weathering.

This railroad magnate's 19th century tower is more than a little bit out of place in the Nevada desert.