Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

Hans Christian Andersen for the postmodern world.

Danish observation tower designed to look like a giant beer bottle.

From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

Blitzkrieg bop your way through Berlin's Ramones Museum.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

This classic restaurant features a gorgeous mirror-clad room.

A slice of central Asia in the middle of Berlin.

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

A brush maker used his factory to protect blind Jews from the Gestapo.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

One of downtown Berlin's last reminders of its Communist past.

A surreal museum of extraordinary industrial objects.

The statue of a legendary giant who carried Christ and shouldered the world's sins.

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

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

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

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

Part of an abandoned19th-century fortress hides in plain sight inside a modern office building.

Every Tuesday, students let off steam by screaming into the night air.