Due to very thick atmosphere, giant airships should be doable on Venus. You'd get atmospheric radiation shielding, same pressure as on Earth (although obviously

Due to very thick atmosphere, giant airships should be doable on Venus. You'd get atmospheric radiation shielding, same pressure as on Earth (although obviously unbreathable air), ample sunlight and plenty of materials (=carbon and oxygen) in the form of Venusian atmospheric gasses. Although hydrogen would be hard to come by, the atmospheric concentration is very low. That said, I doubt there's that much hydrogen on Mercury either. So who knows, maybe Venus is a better place for a human base than Mercury?