Send a postcard while vacationing with Satan.

Cavernous opening completely encased in Karst limestone.

The world's most active stratovolcano is almost always erupting.

Tourists to the mountaintop Sicilian town often overlook its ancient fortifications.

Italian cave with exceptional acoustics and an unsavory history.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.