The remains of a military communications outpost still stand on this Greek island.

Gargoyle head that brings good luck.

Menacing or in memoriam, the Silent People and their meaning are left to interpretation.

Rent a barrel for a personal view of where the Baltic Sea meets the Gulf of Riga.

This impressively complicated radioastronomy research center was once a tool of Soviet spies.

The widest natural waterfall in Estonia is a sight to see in all seasons.

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

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

A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

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.

Pigduck of Turku.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

The pyramid and dome deep inside the Dzūkija forest are believed to channel divine energy.

Over time, this castle grew to encompass the entire island.

This 13th century Gothic brick castle is the largest in the world by surface area.

Boats must transform into railroad cars to navigate this Polish canal.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

These massive moving sand dunes have swallowed an entire village and are still on the run.

The home of the morbid art of corpse plastination is open for visitors to view the fascinating, but stomach-churning process.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.