In this subterranean brick arcade, a small shop continues the ancient practice of bookbinding.

An eclectic restaurant serving from and to the nearby Chittenden Locks.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

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

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

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

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

Baroque celebration of the end of the Great Plague of Vienna.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Cold war icon and onetime "hole" in the iron curtain.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

The "Prussian Versailles" that is as glorious today as when it was built.

Model Trains and Much More in Hamburg.

The prototype for all Nazi concentration camps.

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