Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

An ancient Egyptian temple sits within a modern European museum.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

A market built atop boats is one of the few floating holiday markets in Europe.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

Sail in for a ’dam good slice.

The bridges portrayed on EU currency aren't fictional anymore.

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

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

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

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

An art installation memorializing a tram stop, which became a tram stop.

A modern reimagining of a medieval city gate.

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

This unusual elevator doesn’t stop or slow down.

This subterranean studio is filled with fascinating kinetic art.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.