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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This 47-story "M" needed 20 years to be completed

The first Russian Orthodox church in North America and an Alaskan landmark.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

Walk behind a 50-meter-high waterfall.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.