One of the best-preserved medieval streets in Europe.

Sturdy scales are a surprising thing to find in a modern European city.

Rediscovered underground chapel is one of the best examples of Gothic architecture in Vienna.

Museum devoted to the artificial language of Esperanto.

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

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

The world’s oldest military museum has remained largely unchanged since the last days of the Austro-Hungarian Empire.

Latvia’s first skyscraper, nicknamed ‘Stalin’s birthday cake.’

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

A unique sculpture calls the outside of this steakhouse home.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

The glowing blue Nymphaeum of Emperor Tiberius.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

A largely overlooked statue that may commemorate the first publication of 'Don Quixote' outside of Spain.

This huge limestone slab is considered the largest paving stone in Belgium and a relic of the earliest modern paving in Brussels.

The beautiful baroque library of the Hapsburg empire.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

An ancient Roman relief beautifully preserved on the façade of a house.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

Statues of a fire-breather, a clown, and a whole performing troupe celebrate Luxembourg's creative side.