Architecture and Civil Ingeniery. Try to stick to cathedrals and transoceanic channels (like the Panama channel). They tend to last for centuries and get well maintained. Just try to avoid the places where a big war is likely.
If you choose for example math, if you are very lucky you will get your own course in a math degree, like Fourier or Galois. The problem is that "your" course will cover not only your work but also the improvements of the next generations, and your exact work will be only a small part. Another problem is that there are only about 10 places for a full math course with a mathematician name, so it's a very difficult to enter this club. (It's easier than building a transoceanic channel, but much difficult than building a cathedral.)
If you choose for example math, if you are very lucky you will get your own course in a math degree, like Fourier or Galois. The problem is that "your" course will cover not only your work but also the improvements of the next generations, and your exact work will be only a small part. Another problem is that there are only about 10 places for a full math course with a mathematician name, so it's a very difficult to enter this club. (It's easier than building a transoceanic channel, but much difficult than building a cathedral.)