CREATE TABLE table_18035 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" FLOAT)

What team was the opponent at Mile High Stadium?
SELECT "Opponent" FROM table_18035 WHERE "Game site" = 'Mile High Stadium'
SELECT "Opponent" FROM "table_18035" WHERE "Game site" = 'Mile High Stadium'