This abandoned Belgian fortress is purposefully being left to nature.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This floating sculpture of ice is a poignant reminder of nature's power.

The Netherlands' first car tunnel has an unusually rectangular shape.

This Dutch statue is a monument to the fictional shrew who brought doom to the city of Stavoren.

The 20-mile causeway that separates the Netherlands from the sea.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

The largest 19th century panorama in the world still in-situ.

This historical Netherlands fortress still bears the marks of its single siege.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

A miniature city, once ruled by the Queen of the Netherlands.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

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

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.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This unattributed sculpture in Amsterdam is hiding in plain sight.

A beautifully eclectic mix of architectural styles.

The attic of a four-century-old canal house hides a clandestine church.

Cat art as far as the eye can see.

Most-visited and most-photographed slot canyon in the American Southwest.