[SunkenCiv]

Thanks dynachrome, cryptobiology/travel ping. Tourist traps are one of the longtime unsung industries of Michigan, and some aren't even open to the public (like "Foamhenge" over on Leonard St, the family's hobby is building homages/fakes). Others are very old, such as Shrine of the Pines.

[Jamestown1630]

You can buy a giant clamshell on Ebay (seriously-they-have-everything) but I don’t think any are nearly that big:

https://www.ebay.com/sch/i.html?_nkw=tridacna%20gigas&norover=1&mkevt=1&mkrid=711-34002-13078-0&mkcid=2&keyword=tridacna%20gigas&crlp=_5067&MT_ID=&geo_id=&rlsatarget=kwd-77515746418674:loc-190&adpos=&device=c&mktype=&loc=90717&poi=&abcId=&cmpgn=395409478&sitelnk=&adgroupid=1240249322668430&network=s&matchtype=e