The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

This free, take-a-book shop seems like a trick but isn't.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."