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

One of Vienna’s oldest (and perhaps most haunted) alleys, allegedly with a bloody past that gave it its name.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

A monument dedicated to a lone, brave invader.

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

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Museum devoted to the artificial language of Esperanto.

Handsomely crafted representations of our round planet.

Baroque celebration of the end of the Great Plague of Vienna.

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

The Habsburgs' royal collections of art and wonders.

Designed as a reminder of one of the darkest moments in Austrian history.

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.

Prank chair from an 18th-century Danish royal court shows the eternal popularity of fart jokes.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

Monument to a suicide protesting the Soviet invasion.

One of the largest squares in Europe contains an entire artificial island.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

This small Milan street is filled with colorful homes and a rich history.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

This striking, historic hotel has major Wes Anderson movie energy.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This strange sculpture depicts a giant nightmare hare crushing a man to death beneath its colossal bulk.