Take a look inside this engineering wonder, a structure that surpasses the height of both the Statue of Liberty and the Washington Monument.

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America's first national park, and easily the most recognizable national park in the world, Yellowstone was made possible by President Theodore Roosevelt, a well-known conservationist.

An elephant in New Jersey? In 1881 James Lafferty designed a 92-ton elephant in the town of Margate. The main room inside of Lucy is 16 by 32 feet and at one point hosted boarders.

Learn about different events that have occurred on October 28th. Some of the events include the founding of Harvard University and the dedication of the Statue of Liberty. Also, the first ticker day parade and the completion of the Gateway Arch.

America's first prison, Eastern State Penitentiary in Philadelphia, became the model for all prisons. It was built in 1829 by the passive Quakers, who believed that solitary confinement was the best way to serve penance.

Sam Riegel was just one block west as the second plane hit the South Tower.

Professor Eric Foner discusses key people and events in the history of the Underground Railroad. He explains how slaves escaped to freedom with assistance from anti-slavery activists.