The Alamillo Bridge, built by Santiago Calatrava, is located in Seville, Andalusia. The bridge was built to offer access to the Isla de la Cartuja, which hosted Expo 92. It consists of two parallel bridges connected by a central section lined with shops and restaurants.
The project was commissioned by the city council in 1991 and completed in 1995. It crosses the Guadalquivir river about 500 meters south of its junction with the Almohad Aqueduct. The main span is 165 feet long and rises 45 feet above high water level. There are also two 15-foot-wide pedestrian walkways on either side of the central section that connect the two main spans.
The reason the bridge was built was because there was no way for traffic to reach the island where the fair was being held without crossing the river first. However, going through town led to more problems than just finding another route. There were simply too many cars for the narrow streets leading up to the bridge. This prompted the city council to come up with an innovative solution: build a new bridge!
The design of the bridge follows the traditional architecture of Seville with some modern additions. The main feature is the huge curving central section which contains the shops and restaurants. This section connects both ends of the bridge via two shorter perpendicular sections.
The Spanish government commissioned the Mission San Antonio de Valero, better known as the Alamo, in 1718, along with military fortifications that would form the basis of San Antonio. The Alamo was constructed to fulfill the needs of Spanish Catholic missionaries and American Indian Catholic converts. The site was selected because it was near water sources and fertile land, and it was protected on two sides by hillsides that could be fortified.
Construction on the church began in 1735 and was not completed until after the Texas Revolution broke out in 1836. The mission was damaged during the war but eventually restored. Today, it is one of the most important Mexican heritage sites in Texas. As part of its annual Christmas festival, the city lights the Alamo itself each year on December 24-25 from 8:00 PM to 2:00 AM.
In addition to its religious function, the Alamo played an important role in the history of Texas. It served as a gathering place for settlers from all over America to discuss their plans to separate from Mexico. These meetings led up to the formation of the Republic of Texas before it became a state. The Alamo has also been used as a refuge from attacks by Indians and Mexicans. In fact, the first documented attack against Europeans in what would become Texas occurred at the Alamo.
The bridge between Yerba Buena and Oakland was built with a cantilever truss design with a bridge pier 242 feet below the water line. Connecting the two was a difficult task in and of itself. A tunnel dug across Yerba Buena Island connected the two bridges. This eliminated any need for traffic to stop at either end of the bridge.
A second bridge, named after its designer, Eames Demetrios, replaces part of the old bridge that carries I-80 over the bay. It opened to traffic in October 2016. The new bridge is a continuous concrete slab spanning from near Jack London Square in Oakland to Yerba Buena Island. There are no vertical supports inside the main body of the bridge.
Traffic on the new bridge will be separated into three lanes: one lane in each direction for vehicles under 40 feet tall; two lanes in each direction for vehicles between 40 and 60 feet tall; and one lane in each direction for vehicles over 60 feet tall.
The new bridge has reduced vehicle travel time across the bay by about five minutes compared to the old bridge. It also provides better access to landings and parking facilities on both sides of the bay.
The project was completed within 16 months at a cost of $6.5 billion. It's been called "the world's first fully automated suspension bridge" because it can be operated by computers instead of people.