Historic barracks utilized during both the Revolutionary War and the Civil War.

A Civil War Museum with some notable medical antiques.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

This small cemetery remains hidden behind a recreation center.

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

One of only two sites in the United States containing the remains of Buddha.

Built in 1815, the stabilized ruins of the grist mill and sawmill are now gated, but interpretive displays on the features and functions of the mill preserve its history.

The ruins of an old mill lie in a small ravine along a hiking trail near Little Seneca Creek.

The whole world in one water tank.

The hidden ruins of a mill that is linked to an attempt to assassinate the vice president of the United States.

One of the last schoolhouses constructed in the early 20th-century still standing in Montgomery County.

This suburban park recalls the history of a famous tavern. Despite the name, it's no ordinary place!

A well-worn trail through thick woods in northern Montgomery County leads to an old schoolhouse.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

The world's oldest continuously operating airport was founded by the Wright Brothers.

One of the largest collections of Catalan literature and cultural materials outside of Spain, created by a community of 1960s expats.

A museum dedicated to Latvian history in the heart of Maryland.

This school was designed to support the rebuilding of African American schools around Delaware.

This historic lighthouse was well known for the large number of women who served as its keeper.

The only public school for Black children in the region from 1895-1936.

Once the center of a thriving early Black community called Martinsburg.

Dating to 1793, this is the oldest building in Poolesville.

Using a massive antenna made up of five miles of wire, two scientists tuned into organic radio waves from the planet Jupiter.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.