An unusual geological feature towers over the remains of a dark episode in United States history.

The only remains of a 1918 section of Route 30.

An old railroad grade built for the construction of Hoover Dam is now a recreational trail featuring several tunnels and sweeping views of Lake Mead.

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

A rural colonial settlement that contains the remains of a store and cooper.

This lovely tree was a thank you gift from the man known as "Public Enemy No.1."

Baltimore's first skyscraper may be home to the inspiration behind pulp fiction's most celebrated bird.

One of the oldest standing structures in Montgomery County, Maryland.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

This once rural mansion now sits in the heart of the city.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

One of the earliest and best-preserved buildings in Charles County, Maryland.

This field of concrete was once an active defense site armed with nuclear warheads.

This disastrous New Jersey safari park saw animal attacks, escapes, and disease before being abandoned.

Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

Replica of an old Esso filling station, complete with Wayne gravity pump and outhouse.

A small flooded ghost town with a few scattered structures remaining.

Water of undetermined depth has attracted rare fish and cult leaders alike.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

In the middle of the desert, miles from any human life, sat an anomalous pay phone that still magically answers your calls.