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Just getting to the centre of the Earth and surviving is impossible. The Earth's core is about 9,000°F—as hot as the sun's surface—and would instantly roast anyone who found himself there. Then there's the pressure, which can reach roughly three million times that on the Earth's surface and would crush you. But let's not sweat the details. Once you arrive at the centre of the Earth, the physics gets really interesting.

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5YrXB TIL there's a 12-foot-tall replica of the Washington Monument hidden under a manhole on the grounds of the monument. Its purpose is that of a surveying tool that's usually just a metal rod, but because of the location this special version was installed.
Oj0g TIL on the show 30 Rock they were so committed to the quality of the “smash cuts” or cutaways that one in particular took 3 days to build the set for only 6 seconds of video
P1NJO TIL the White House was open to the public until the early 20th century. In 1829, 20,000 citizens followed President Andrew Jackson back after his inauguration. The rowdy crowd packed the White House, forcing Jackson to flee to a hotel. Aides eventually lured them out with tubs of whiskey and OJ.
LQd8V TIL that Vince Guaraldi, who composed the music for the Peanuts TV specials, was good friends with The Grateful Dead. He appears on the back cover of their album Aoxomoxoa (sitting on a horse), and supposedly played with them as a temporary keyboardist in the early 70s.
0d4X1 TIL that in 1948, a U.S. Air Force meteorologist suggested testing nuclear weapons on the East Coast but was rejected. Instead, the weapons were tested in the West and exposed millions of Americans to fallout.