This abandoned horse racing track was an exercise in hubris from its inception.

A self-built castle made by a mysterious man.

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

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

A public urinal so pretty, it was declared a national monument.

Amsterdam's former hotspot for public executions and dissections.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

A set of seven houses, each built in a style that represents a European country.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

Survival capsules find a second life as a unique hotel.

This colorfully-painted tunnel links two distinct parts of a historic neighborhood.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Museum preserving torture methods from the past.

High-end dining has a home in this former gas station.

Pittsburgh's literal underground railroad.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

This secluded walking trail is a hidden gem of a Pittsburgh park.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

A private residence adorned with a gorgeous mural dedicated to the buzzing insect.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.