Ancient Hon Chuong Cham Tower

This massive and complex stone tower is a great example of the many pre-historic nuraghes on the island.

Trek up to an abandoned fire lookout from the 1930s for an unimpeded view.

The fire tower along this steep, scenic hiking trail offers the best views of Maine’s Moosehead Lake.

A stone from Africa's tallest peak is immortalized in a Potsdam palace—but is it actually the mountaintop?

A former millstone quarry in the Italian Alps is strewn with rocks bearing distinct round shapes.

According to legend, this structure was inspired by the Tower of Babel and built in a 19th-century industrialist's yard so he could walk his dogs without leaving home.

A 100-foot metal tower and swinging bridge that provides stunning views of mountains in five states.

This Colorado fire station has been in continuous operation for more than a century.