This unique historical monument features large concrete spheres designed to resemble fallen stars.

The oddly shaped, steam-spewing building is now an art studio and gallery.

One street divides a single town that stands in two U.S. states.

This historic mansion was built as a symbol of love between a husband and wife.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

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

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.