An alley covered with 20 years of bubble gum.

A hotel and restaurant serving as the mecca of kitsch.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

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

A vast Communist-era exhibition space in the Bulgarian capital.

"Holy Wisdom" overlooks the city that became its namesake.

A striking symbol of the Bulgarian capital.

A collection of art from Bulgaria's time as a communist state.

The world's largest single-aperture telescope resides in the Canary Islands.

The largest salt farm in the Canary Islands is located at the foot of an active volcano.

These wooden balconies that are both decorative and functional.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

This colorful statue welcomes visitors to a Barcelona park.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

An early 20th-century bullring converted into a modern shopping center.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Volcanic rocks ground down into sand make this Spanish beach as black as night.

This lucky bronze frog was gifted to Madrid by a casino.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.