An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

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

These crumbling Latvian forts make for some haunting seaside ruins.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Paris' linguistic guide to the international language of, yes, love.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.

Hundreds of hidden passageways weave through the old quarters of Lyon.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

The silly symbol for an underground protest group is now scattered around the city.

A striking public sculpture representing the period of martial law in Communist Poland.

A collection of old neon signs from all over Poland line a secluded courtyard.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

This controversial monument was designed to lionize the Red Army, but also disheartened the Latvian people.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.