Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.