This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

If the tunes of antique organs and musical marionettes don't intoxicate you, the draft beer certainly will.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Vibrant street art created with mixed media.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

The largest flower auction house in the world.

A solid steel plane designed to catch fire over and over again.

The birthplace of most all of Europe's space missions is here on the Dutch coast.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

The largest airborne operation in history was launched to capture this bridge.

Organisms normally seen under a microscope decorate this church.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

The location of the world's first telescope demonstration.

Lumps of significant stone from around the world surround a flaming monument for peace.

An independent cinema housed in a former pathological anatomy laboratory.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

While it now takes more than a dime to open an account this historic Brooklyn bank still displays the opulence of the gilded age in which it was built.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.