What is the most costliest means of transport exceptair crft and rockets?

The most costly means of transport, excluding aircraft and rockets, is typically luxury yachts, particularly superyachts. These vessels can cost millions to billions of dollars depending on their size, features, and customizations. Maintenance, crew salaries, and docking fees further contribute to the high overall expenses associated with owning and operating a superyacht. Additionally, specialized transport options like private trains or high-end luxury cars can also reach significant costs, but superyachts generally top the list.