This castle has links to Portugal’s founding and struggles for independence.

A black cat protests the City Guild in Riga's Old Town.

Flamboyant architecture from the turn of 20th century.

One of two electrical towers in Germany that have a pathway constructed through the tower's legs.

Launch site for nuclear war against Western Europe.

This micro-nation may be some sort of prank, but its constitution sure seems official.

A narrow strip of land is home to the tallest migrating dunes in Europe.

Sculpture garden of religious statues made it through Soviet rule.

A memorial to the murdered Jews of Kaunas.

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

This dome-shaped mountain boasts amazing views and has a rich religious history.

An abandoned anti-smuggling station decays along the boundary between Portugal and Spain.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

A statue of Vladimir Illyich Lenin guards this abandoned building in the "Forbidden City."

This riverside restaurant has been serving customers since 1146.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

Tower with a double-helix spiral, adorned with letters of the Georgian alphabet.

Fast food feels like fine dining at this award-winning modern Georgian building.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

The first skyscraper to include a Ferris wheel built into the facade.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

Underground monastery and fortress.