Sinus infections usually begin with the symptoms of a cold (for example, a runny nose, occasional cough and/or mild fever), and then develop into pain and pressure in the sinus cavities. About 7 to 10 days after initial cold-like symptoms other symptoms develop that suggest you may have a sinus infection.
The Ruins of Sescheron. The Ruins of Sescheron are available in the Adventure Mode of Diablo III. Specifically in Act III, near the Arreat Crater. They were released as part of patch 2.3. The area is designed to have a melancholy feel to it, with elements such as funerary art and pyres.
The mysterious cave is a location in the Big MT in the Fallout: New Vegas add-on Old World Blues. It is located south-southeast of Big MT north tunnel and southeast of Forbidden Zone dome entrance. It has nearly the same layout as broc flower cave, without the radioactive barrels and lit torches. It is west northwest of Elijah's Watch.