An urban laboratory.

This expansive bridge in the Canadian wilderness was originally just built for friends.

The fairy tale castle of the "fairy-tale king."

A wall of chewing gum moonlights as collective art.

This small, but long-running hobby club has built one of the largest model rail lines in the US.

A bloodstain from "the wound of the transverberation of the heart."

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

A preserved oak tree about 3,500 years old found in Riga, Latvia.

3,000 market stands in five former Zeppelin hangars.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

A small monument in Lithuania marks the geographic center of Europe—or at least one of the claimants.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

Walk 2,300 feet above the ground on the "Troll's Tongue."

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

The oldest stone house in Paris was built by its most famous alchemist.

Rising from the sea like a stone monster.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.