A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A local prank turned town icon.

An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

This collection honors the iconic, and proudly American lighter that just won't quit.

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