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

3,000 market stands in five former Zeppelin hangars.

The reconstruction of this prominent building fulfilled a long-written command.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

The 20-mile causeway that separates the Netherlands from the sea.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

This stream-carved gorge has inspired poets, hidden smugglers, and trained soldiers, all without losing its beauty.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

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

The world's largest wooden structure.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

Giant topiary dog once played a role in a terrorist bomb plot.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.