This research center for rare prosimians is studying how they sleep to help prolong human life.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

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.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The humble horn finally finds a place in the sun.

An eerie, decaying ghost town destined to fade into the forest.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A museum dedicated to exhibiting remarkable outsider art.

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

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

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

A daily replay of the experiment that proved the rotation of the Earth.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

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

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Where America's first doomsday cult awaited the end of the world.

A rare view of a preserved Victorian science museum.