This striking clock tower was once part of the Singer sewing machine factory.

The first blast furnace in the United States that used coal and coke fuel instead of charcoal to make pig iron.

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

This is the cabin from which John Brown and his men launched their fateful war to end slavery on October 16, 1859.

A ghostly cabin attempts to reverse the erasure of enslaved people through poetry.

Lines on the pillar of Heidelberg's Karl-Theodor Bridge record the dramatic heights of past floods.

These hilariously laughing bronze figures lampoon empty promises while encouraging civic engagement.

A history of the U.S. military, with a focus on Pennsylvania's contributions.

See the imprints of ancient trees, burned and preserved by lava.

This museum focuses on the history and culture of the German settlers in Pennsylvania.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

A terrace reminiscent of Rome's Spanish Steps is tucked away in a little park in Washington, D.C.

In suburban Maryland, a tree grown from seed flown to the moon stands almost forgotten.

An American industrialist hoped this nature preserve could help save the North American bison.

Where three rails and three centuries of transportation meet.

10,000 flowered plants bloom in the City of Roses.

There has been an astronomical clock on this spot since the 14th century.

A small park honors the legendary Ukrainian poet.

Constrained by time and topography, this civil engineering landmark was constructed 100 feet above Starrucca Creek over the course of a single year.

A glimpse of the Pacific Northwest‘s indigenous culture in Washington, D.C.

This iconic neon jester is a local landmark that you might recognize from his cameos in film and television.

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

A larger-than-life monument to the inventor of the Bunsen burner.

The United States' only educational center specializing in disease vectors and mosquitoes.