Beautiful views of the surrounding hills and birds of prey can be found at this sanctuary.

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

It would take 35 firetrucks to fill this enormous glacial pothole.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Yo, Adrian!

World's first "penitentiary," meant to be humane, drove men insane.

Dr Barnes' $25 billion private collection of art and arboretum.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This elaborate towering structure was once famed for its revolutionary height.

Once America's tallest structure, now a Baltimore landmark.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

Walk through the history of American pop culture.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.