An observatory 100 m up in Beppu City that gives a full 360 degree view of the city. It's part of the Beppu International Convention Plaza (B-Con Plaza) and about 15 minutes on foot from the west exit of Beppu Station, just across from the western side of Beppu Park. Another similar option is the older Beppu Tower.
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竹細工伝統産業会館
Has displays on bamboo craftsmanship and offers courses on making your own. Buses run from JR Beppu Station.
竹瓦温泉
A Meiji-era classic. The hot bath is extraordinarily hot, and signs gently remind you that the regulars like it that way. If you're not in a hurry, take a dip after you've been buried up to your neck in hot sand on the other side of the building. Tickets come with a yukata. Step into the changing room to stash your valuables, change into your yukata, head through the curtain, and then lay down in the sand pit (with the yukata on); an attendant will be along to shovel hot sand on you shortly. (Cameras are welcome — they're happy to take photos of you while you're buried.) After ten minutes or so, you'll emerge from the earth and shower back in the changing area. It's between Ekimae-dori and Nagarekawa-dori, one block before the intersection with Route 10.
堀田温泉