This coaster at Nagashima Spa Land Amusement Park in Mie prefecture, Japan, boasts the longest track length on the planet: a mighty 8,133 ft. (2,479 m). Because the Steel Dragon, named for the Chinese year of the dragon in 2000, was built in Japan, it required far more steel than other roller coasters because of the necessary earthquake protection, putting its cost at more than $50 million. So if you hear screams emanating from the park, it might not be not the people on the coaster but rather the Nagashima accountants.