The tower is a museum which is pretty nice and a little challenge to climb the stairs. The tunnel tour is not very well known but is very, very well done. After a short video you are escorted down into the tunnel which, by the way, is about 50 degrees F. It is very interesting and there are some additional videos to see along the way. In total the tour takes about 75 minutes and probably an hour more to tour the tower.
Make reservations in advance so you won't be disappointed.
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