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

The fairy tale castle of the "fairy-tale king."

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

A beautifully rebuilt windmill from the 17th century, situated along the Amstel River.

The name Niarbyl means “the tail” and refers to the rocky formations that push out into the Irish Sea.

Believed to be the former location of one of the earliest Viking assemblies in Europe.

This Victorian water wheel is affectionately nicknamed "Little Isabella."

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The former site of the U.S. military base redeveloped as an art district, boasting a collection of 109 public artworks from 36 countries.