The Landmark Series are Nighthawks with paint and finishes that represent United States national parks and monuments. Each Landmark guitar is marked "Landmark Series" on the back of the head stock and includes a decal identifying the park or monument it commemorates .
The Landmark Series was issued in 1996. It has two M-Series mini-humbuckers instead of the standard Nighthawk combination of one mini-humbucker and one slanted humbucker (SP2) and optional center singe coil (SP3). Sometimes they have all gold-plated hardware.
As I write this (August, 2019), there is one in nearly mint condition for sale here in Thailand for 34,000 baht, and another in Germany for 995 Euros, both about $1,100.