Home to a protest movement, a bombing, and a dramatic change in labor history.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Unusual building appears to be haphazardly built from randomly piled bricks.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

One of the most powerful religious centers in the Middle Ages, dubbed the founder of Western monasticism.

In this coastal town, the time-honored tradition of reenacting the struggle between the Christians and Moors includes the arrival of the Moorish fleet.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.