Washington Monument in Washington

The Washington Monument is probably one of the best-known obelisks on earth. Built during the 19th century, it is a monument to the military achievements of George Washington during the Revolutionary War. Standing more than 550 feet (170 meters) high, it is the most prominent structure in Washington, D.C. It’s viewable 24 hours a day, though it’s not possible to get to the top for stunning views of the capital. The monument has been closed since it was damaged in an earthquake in 2011. A reopening date has not been scheduled yet.