From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

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

Every winter, this former planetarium is transformed into a massive, brightly-lit Christmas ornament.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

Construction of Barcelona's iconic (but controversial) church is expected to be 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.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A dozen cast iron leopards stand guard along the length of Aberdeen's Union Bridge.

Designed to allow funerals to proceed over the River Dulnain.

Cut into a sheer cliff face, these stairs are the only way to reach a secluded Scottish harbor.

The largest terracotta fountain in the world, built to commemorate Britain’s Victorian achievements.

These rusting, skeletal structures are monolithic monuments to Glasgow's industrial past

Though difficult to access, this stunning cave has a place in Scotland's poetic history.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

A bronze tribute to the wildly popular video game from the '90s.

This brilliant display of whirling fireballs celebrates Hogmanay.

This Scottish castle has witnessed clan rivalries, Jacobite uprisings, whisky smuggling, and more.

The last manually operated turntable ferry in the world.