What are some tourist attactions

Hint 1 of 8:

233-20  planet #2 35Sx99E Phlegmak base with egg in handle of the ax.

Hint 2 of 8:

215-86  planet #3         Old Earth itself.

Hint 3 of 8:

180-125 planet #2         Old Empire world New Scotland.

Hint 4 of 8:

143-115 planet #1 28Nx4E  Old Empire ruins.