London Underground 1:1 Scale Tent - $3,333
This is the one thing on this list that can trump one of the all-time tent greats: the wedding tent. Well, if you used the London Underground full-scale tent for a wedding, you would win summer, hands down.
Ethan Wolff-Mann is an editor at Supercompressor. His birthday is in the late summer, and he wants that train tent. Follow him on Twitter @ewolffmann.