The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

A World War II-era submarine is stuck in the mud in New Jersey.

The world's newest astronomical clock is also its most accurate.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

This circus town museum recognizes the outstanding clowns of history.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

Each year, teams of the world's best snow sculptors have 65 hours to create frozen masterpieces.

The massive machine creates cracking displays of indoor lightning.

An unusual sand beach in the middle of a forest.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.