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

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The celebrated eyesore created by starry-eyed sweethearts.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

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.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

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

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.

Steadily reminding Czechia of its past.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

A system of constructed rapids and concrete waterfalls in a linear park on the Slepnya River.

A beautiful and moving memorial set on a little island in the middle of the river in Minsk.

A unique park tells the geological history of Belarus in a national “map” of thousands of boulders and blue spruce.

A symbolic graveyard for the villages that perished during the Nazi invasion of Belarus.

The apartment building where JFK's assassin lived after defecting to the Soviet Union.

Remnants of the city's Soviet history hover over this modern fast-food outlet.

Glowing orb in Minsk houses 8,600,000 items.