Recovered from the brink of extinction, at home in the Financial District.

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

An astounding collection of medical specimens, including bits of President Lincoln.

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

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

Patrick Dougherty's fantastic living tree sculptures, mind-blowing but temporary.

This structure among the trees was the result of divine inspiration.

The largest ancient burial mound in Ohio.

The largest earthwork effigy in the world.

An abandoned relic of the city's failed experiment with below ground transit.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

A suspended garden, now gone, once hung in the middle of this abandoned church.