This hidden fire lookout offers spectacular views of Sequoia National Park.

The echoes of a railroad town that solemnly mark the end of the line.

There is beauty and history in the ruins of this former company town.

A 19th-century architectural wonder designed by the "father of the skyscraper."

Town full of spiritualists, some of whom are mediums, is still in full swing after 130 years.

The seat of Buffalo government is a gorgeous Art Deco palace.

Toxic waste disaster that founded the Superfund program.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

Francis Julius LeMoyne built this crematory in 1876; he was the third person to be cremated here.

Each step is a mere four inches tall, said to be measured by the stride of a woman wearing a hobble skirt.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This abandoned amusement park was built on a site with a dark history.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

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

A monument marks the location of the first successful steamboat demonstration.

The whole world in one water tank.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

Tiny observatory made big contributions to the study of the Earth's motion.

Endless rows of boxes of paper records line the hallways of the archaic federal facility where guns are traced.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.