In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This subterranean studio is filled with fascinating kinetic art.

A beautifully eclectic mix of architectural styles.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

The world's only museum devoted to the wonders of fluorescence.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

A giant glider—designed by the father of the Rubik's Cube's designer—now soars within a shopping mall.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

The true meaning behind this sculpture remains unknown.

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

This building has survived for more than a century and remains virtually untouched.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

Some of the greatest minds in the history of Hungarian art and science converged in this café.