This is the arch at the North Entrance. It was dedicated in 1903 when Theodore Roosevelt laid the cornerstone. It was designed by Hiram Chittenden (who also designed the original Fishing Bridge and the Chittenden Bridge - which was replaced in 1962 and named the Chittenden Memorial Bridge). It was built for the cost of $10,000. Besides the Old Faithful Inn this is probably the most well known man made structure associated with Yellowstone.