The Cochrane Bridge, the Causeway, the Bankhead Tunnel and the George Wallace Tunnel are constructions of the last 100 years. Their goal to get you from Mobile to the Eastern Shore and vice versa.

Here's 5 quick facts about their history:

1. Before the Cochrane Bridge and Causeway opened on June 14, 1927, the only way across Mobile Bay was via a Bay Boat. Toll rates were high at $3.50 to $6 each for the 10-mile ride. That would be about $45.66 to $78.27 in today's dollars.

2. A bridge was suggested for a more centralized route to downtown between Mobile and the Eastern Shore in the 1930s. However, many felt the bridge would interrupt commerce on the Mobile River, interfere with Mobile's scenic beauty and displace local businesses.

3. The Bankhead Tunnel and the George Wallace Tunnel were built the exact same way. The tubes were constructed in Mobile, launched into the River, workers would enter the tubes floating in the river through a hole in the ceiling, and barges were used to keep the tube floating as concrete began to weigh it down.

4. In 1951, the consulting engineers for the Bankhead Tunnel, Palmer & Baker, Inc., suggested that a second tube would be needed in five years.

5. The original proposal for the second tunnel was for it to be built south of the Bankhead and to accommodate eastbound traffic, while the Bankhead would continue serving westbound traffic.