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

The widest waterfall in Europe is a natural wonder and one of the only places where fish are caught in the air.

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

Flamboyant architecture from the turn of 20th century.

Spend the night in 1920s Latvia in this historic recreation and movie set.

These crumbling Latvian forts make for some haunting seaside ruins.

3,000 market stands in five former Zeppelin hangars.

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

Just another terrifying garden filled with hundreds of endlessly smiling doll people.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

This former coal gasification plant found a curious second life as a popular public park.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

A giant Troll lurks under one of Seattle's oldest bridges.

A walk through the historic city center, under the streets of Seattle.

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

Hamburgers are intensely proud of their tunnel beneath the river.