CT scan showing radiofrequency ablation of a liver lesion. RFA may be performed to treat tumors in the lung, liver, kidney, and bone, as well as other body organs less commonly. Once the diagnosis of tumor is confirmed, a needle-like RFA probe is placed inside the tumor.
After the completion of the iron staircase in the monument's interior, the Washington Monument was first accessible to the public in 1886, closed much of 1887 until it could be better protected from vandals, and reopened in 1888 with a public elevator.
Made of some 36,000 blocks of marble and granite stacked 555 feet in the air, the monument was the tallest structure in the world at the time of its completion in December 1884. In the six months following the dedication ceremony, over 10,000 people climbed the nearly 900 steps to the top of the Washington Monument.