Here’s where you can get a coveted “golden passport.”Phnom Penh, Cambodia.Credit: Tibor Bognar/Getty ImagesThere are a few paths to gaining citizenship in a country you weren’t born in—from naturalization to proving your ancestry. While most of the time, either process is relatively lengthy and requires a significant amount of paperwork, you can go about it another, usually faster, way if you have the funds. Known as citizenship by investment, o…