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

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

The topiary maze at the Habsburg hunting lodge.

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

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

Large miniature theme park with 100-plus models.

Have tea in a cemetery with a dazzling view of Istanbul.

Step back in time and witness the fall of Constantinople.