The history of sea-faring refuse and disaster is on cramped display in this Netherlands folk museum.

This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

This concrete church spent a period of its history as a World War II bunker.

This 12th-century castle majestically overlooks the city and the beautiful Mosel River valley.

A gigantic teapot sitting on top of a parking garage in the center of Utrecht.

Atop this former dutch railway office sits an interstellar work of art.

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

The highest point in Belgium is a staircase to nowhere.

Climb inside an iron crystal magnified 165 billion times its normal size.

This Moorish fortress has guarded Málaga from the slopes of Gibralfaro hill for nearly a thousand years.

An ornate private entrance to the Vienna subway built specifically for the emperor.

Visiting this café is like visiting the Austrian grandma you wish you had.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A spherical "micro-nation" in the heart of Vienna.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The beautiful baroque library of the Hapsburg empire.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Handsomely crafted representations of our round planet.

Legends surround an ancient tree trunk riddled with nails for good luck.

These two 15th-century metal rods allowed people to check if they were swindled or not.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.