This former hydraulic laboratory is now a woodland dotted with old engineering models.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

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

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

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

Peek through a transparent pyramid and drink in the mountain made of books.

Graffiti covers the walls of a room where university students through the centuries have waited nervously to defend their theses.

An enormous Polaroid picture adds an artistic flair to Rotterdam.

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

A statue of the second-tallest Dutchman in history.

This ancient monument has been dissembled and put back together at least twice.

A dramatic art installation features a BMW flying out of a building in Rotterdam.

The largest flower auction house in the world.

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

Remnants of the Roman empire's northern frontier nestled in suburban Glasgow.

The ornate structure is part of a building boasting more marble than the Vatican.

The sole surviving large cairn in an area that was once littered with burial monuments.

A massive stone fox oversees a Rotterdam elementary school crosswalk.

An unassuming rod in the Netherlands was once the old standard unit of length for the entire Dutch empire.

People have been placing babies on these lilies for photoshoots since the Victorian era.

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

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

A floating cat sanctuary on an Amsterdam canal.