Hidden above an alcove behind a forgotten waterfall could be one of the last intact temples of a long persecuted religious order dedicated to the worship of their water elemental patron.
The dread pirate Corvorane was legendary even after his capture and conversion to a privateer. His secret fortress and hidden treasure are of equal fame. But more than gold lurks in the depths of Corvorane’s Cave.
The Lost City of Paldor was never really lost. Everyone knew where it was. However, nobody could get to it. Unknown to most, recent Land-Waves (Earthquakes) have opened up the paths to Paldor.
On a location with numerous webs, and at least one big spider, there is a something inside a cocoon. It is humanoid in shape, still moving. If the heroes free it (not before they kill or drive away the spiders), they meet a ... zombie!
The poor zombie wandered the dungeon alone, and tried to kill a big living creature (= a spider). The spider used the usual treatment, even if this victim did not look tasty. The zombie can be easily killed as any other zombie. It got but several doses of spider-poison, so can be something worth if it is extracted. You can mention to a druid or ranger the fact the spider had no poison anymore.