The only working large-scale tea plantation in the United States.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

FDR's Art Deco hospital tower was hopelessly inefficient.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The whole world in one water tank.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

A former major munitions plant that has been converted into a sprawling art space.

Once America's tallest structure, now a Baltimore landmark.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

This free, take-a-book shop seems like a trick but isn't.

At 207 feet, one of the world's longest continuous escalators.

A museum dedicated to exhibiting remarkable outsider art.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Eighteen miniature death-scene dioramas.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

An artist's cute bronze subway sculptures belie his violent artistic past.