Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

This claimant to the title of "smallest church in the 48 states" doubles as an equally tiny, quasi-post office.

The highest point in Maryland is only accessible by hiking through another state.

The smallest covered bridge in Maryland.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

One of the only memorials dedicated to journalists who died in combat.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.