Ship-sized kinetic sculptural fantasy.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

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

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

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

Climb inside an iron crystal magnified 165 billion times its normal size.

Puzzles within puzzles hide a golden treasure in this hedge maze.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

A replica of the steam engine that hauled Queen Victoria's Royal Train is on display at Windsor.

All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

Locals call it the "Give Peas a Chance" bridge because of its distinct graffiti.

The world's oldest model village.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Four-story slides send people whizzing through the math department at this Munich university.

The footprint of a frustrated devil in Munich's Cathedral.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

Race through the maze, get your name on the sign.