Premium Challenge
CURATED
Gone But Not Forgotten
Recognise five Big Things you genuinely visited before they disappeared.
HISTORICAL CHALLENGE
This is a record of past visits, not a travel list.
The Big Things in this challenge are historical or no longer available as ordinary destinations. Only genuine visits made while they existed count. Project Big Things will not recommend travelling to them, and their listing pages keep current travel and navigation actions withheld.
Premium Challenge Library
The challenge exists and its Big Things remain part of the free field guide. Premium unlocks the curated qualifying set and challenge gameplay.
Premium never changes access to the underlying Big Thing listings, safety information, navigation facts or your Visits. If Premium becomes active later, existing Visits – including Visits made while membership was inactive – are re-evaluated automatically.
About Premium
PREMIUM DEFINITION
The qualifying set and your exact progress stay private until Premium is unlocked.
This browser receives neither the curated member list nor a personal progress total for a locked Premium edition. That same boundary prevents listing pages and Explore from revealing which Big Things belong to it.
ABOUT
Why this challenge exists
Any five genuine historical Visits from the explicit historical pool; absent objects never create travel recommendations.
Edition 1 · published 28 August 2026
Challenge definitions are versioned. If later research changes a qualifying set, a new edition is published – an achievement you have already earned is never taken away.