Mysterious 500-year-old tapestries depict a unicorn hunt.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

The highway's southernmost spot is a beloved local attraction.

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.