International space station

The International Space Station geocache (GC1BE91) is one of the most extreme and inaccessible caches ever hidden. Published on 14 October 2008 by Richard Garriott, a video game developer turned space tourist, it physically sits in locker number 218 of the Russian segment of the International Space Station. It holds absolute records in geocaching: it is the highest cache in the game, orbiting at around 400 kilometres (250 miles) and travelling at more than 27,000 km/h (17,000 mph). Unsurprisingly, it carries the maximum difficulty and terrain rating (D5/T5). Unlike ordinary caches it holds no logbook, for safety reasons linked to fire risk in space, but it originally housed the Travel Bug TB5JJN1.

In November 2013, Rick Mastracchio, alias AstroRM, then a NASA astronaut, logged the FTF, five years after the cache was published. He also took the trackable with him on his space mission.

Faced with a growing number of fraudulent virtual logs from players claiming the find from their sofa, the cache page was eventually locked to prevent fake found-it entries. So before heading for the stars, remember to drop Signal a message so you can log it!