A hidden oasis in the heart of Minneapolis is also an Important Bird Area.

An amazing collection of sculptures and art.

Come for the giant taxidermy lion, stay for the knick knacks at this Minneapolis curiosity shop.

This lab's maddening silence is good for business but bad for sanity.

This former POW camp was transformed into a Cold War missile installation.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

An overgrown garden stands as a grim marker of an unrealized dream.

This millstone-topped marker details the history of a mill that served as a landmark for both Union and Confederate soldiers during the American Civil War.

Little has changed in the way that this mill operates since the 18th-century.

The location where the American Revolution ended.

This monument traces the segregation line that inspired the first rural branch of the NAACP.

Recorded as the first person buried in Arlington Cemetery.

This Federal-style plantation house was once visited by Abraham Lincoln to meet with generals during the Civil War.

The well-preserved remnants of a bridge that once made up a WW1-era military railroad.

A 100-foot metal tower and swinging bridge that provides stunning views of mountains in five states.

Built to defend Washington D.C. during the Civil War, this fort became a post-war nucleus for a thriving Black community.

This "castle" is actually a limestone and quartz formation hidden along a trail.

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

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

This unique structure is the only one of its kind in Virginia.

This homestead was occupied by Union soldiers, who believed the owners were signaling Confederate forces.

This former Cold War missile control site played an important role in the creation of GPS.

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.

This little brick tunnel built by Confederate forces was used to conduct surprise attacks on the railroad.