A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Colorado's only active volcano last erupted around 4,000 years ago.

This ruined relic of the medieval city of Jahanpanah is a quiet oasis in the middle of New Delhi.

An unassuming tomb houses an important milestone in Indian architectural history.

Visit a haunted Mughal mosque and the tomb of a Sufi saint and his disciple.

This diesel train serviced the Brooklyn waterfront for more than three decades.

A well-preserved example of an early industrial operation in the northeastern United States.

One of the oldest surviving bars in the United States, located at the site of the last skirmish of the American Revolution.

Though it may look like it’s missing its outer shell, this skeletal cast-iron tower was built to withstand wind and waves.

Joseph and Victor Stanzel were Texas farm boys who built a model aircraft empire.

A morbid gateway to an Alaska town prides itself on the hunting history it represents.

This super-sized statue is the only public memorial to the deal that ended America's neutrality during World War II.

This mile marker stands at the unofficial end of a highway built to defend the United States from a Japanese invasion during World War II.

The United States' oldest Episcopal church still in active use.

The elevator hidden in a smokestack on Roosevelt's yacht now serves as a monument to the former president.

This one-room schoolhouse played a significant role in the education of Black children for almost 100 years.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

Both the building and blades of this reconstructed 19th-century windmill can turn in a breeze.

This apartment building designed by a notable Washington D.C. architect housed the Qing Dynasty's Legation.

A brass and marble scale model of the solar system embedded in the concrete.

The longest-covered bridge in the state of Maryland.

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

The tombstone of the founder of the lost town of Ogletown is now stuck inside a traffic median.

A rural colonial settlement that contains the remains of a store and cooper.