This bike path was sunk below water level for maximum wonder.

These ruins reveal the remarkably intact layout of a Roman marketplace.

A luxury hotel housed in a former 15th century Gothic church.

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

Incredible labyrinth of man made caves.

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

This Khmer temple is named after a young woman who sacrificed herself to protect the city from a disastrous deluge.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

This handsomely carved wooden church is more than 800 years old.

"World machine" built by an untrained Austrian farmer.

This "mathematical tower" was an observatory, early skyscraper, and place to reflect on all of nature and the cosmos.

Is this a portal to another side of the cosmos?

The personal charnel house of Anton Bruckner.

Artfully arranged bones of 5,800 Austrians.

A monument marks the site where the famed composer stopped to relieve himself on a long journey. Just one problem: Mozart never went to Raschala.

One of the best-preserved wooden manor houses in Latvia, decorated with painted interior walls.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

It's rumored this unique Baltic beacon was designed by Gustave Eiffel himself.

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

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

From amidst her whirling waves, this mermaid sees all who pass through St. Swithun’s Church. If local legends are to be believed, she serves as a warning.

It's believed King John of England stayed at this 13th-century castle before riding off to sign the Magna Carta.