The 20th century, in particular the latter half, played host to some of the most ambitious scientific projects in history. Atlas Obscura's feature Ruins Of Super Science takes a look at some forgotten gems, many of which are in a state of disrepair. There's the Kola Superdeep Borehole, a Russian project to drill as far into the earth as possible, which reached a stunning 7.5 miles deep; the Project HARP Space Gun, which as the name suggests was a joint US-Canadian project that aimed to fire a payload into space (it never succeeded); and Nikola Tesla's Wardenclyffe Tower and Laboratory in Long Island, NY, the birthplace of many of Tesla's experiments, and the subject of a successful campaign last year to turn the lab into a Tesla museum. There are a total of ten projects in the feature — it's a must-read for anyone interested in the limits of human endeavor.