Architecture:

Baltimore is the home of the National Aquarium, one of the world's largest

Washington Monument, in the Mt. Vernon neighborhood of Baltimore
Baltimore exhibits examples from each period of architecture over more than two centuries, and work from many famous architects such as Benjamin Latrobe, George A. Frederick, John Russell Pope, Mies Van Der Rohe and I. M. Pei.
The city has architecturally important buildings in a variety of styles. The Baltimore Basilica (1806-1821) is a neoclassical design by Benjamin Latrobe, and also the oldest Catholic Cathedral in the United States. In 1813 Robert Cary Long, Sr. built for Rembrandt Peale the first substantial structure in the United States designed expressly as a museum. Restored, it is now the Municipal Museum of Baltimore, or popularly the "Peale Museum". The McKim Free School founded and endowed by John McKim, although the building was erected by his son Isaac in 1822 after a design by William Howard and William Small. It reflects the popular interest in Greece when the nation was securing its independence, as well as a scholarly interest in recently published drawings of Athenian antiquities.
The Phoenix Shot Tower (1828), at 234.25 feet (71.40 m) tall, was the tallest building in the United States until the time of the Civil war. It was constructed without the use of exterior scaffolding. The Sun Iron Building designed by R.C. Hatfield in 1851, was city's first iron-front building and it was a model for a whole generation of downtown buildings. Brown Memorial Presbyterian Church, built in 1870 in memory of financier George Brown, has stained glass windows by Louis Comfort Tiffany and has been called "one of the most significant buildings in this city, a treasure of art and architecture" by Baltimore Magazine. The 1845 Greek Revival style Lloyd Street Synagogue is one of the Oldest synagogues in the United States. The Johns Hopkins Hospital, designed by Lt. Col. John S. Billings in 1876 was a considerable achievement for its day in functional arrangement and fire proofing.
I.M.Pei's World Trade Center (1977) is the tallest equilateral pentagonal building in the world at 405 feet (123.4 m) tall.
Future contributions to Baltimore's skyline include plans for a 717 foot (218.5 m) tall structure known as "10 Inner Harbor". The building was recently approved by Baltimore's design panel, but as of January 10, 2010, ARC Wheeler had yet to break ground on the project. It will include luxury condominiums, a hotel, restaurants, and shopping centers. The Naing Corporation has approved a tower of 50-60 floors for the lot at 300 Pratt street, with the design currently being finalized. The Inner Harbor East area will see the addition of two new towers which have started construction: a 24-floor tower that will be the new world headquarters of Legg Mason, and a 21 floor Four Seasons Hotel complex.
The streets of Baltimore are organized in a grid pattern. The streets are lined with tens of thousands of brick and Formstone faced rowhouses. Many consider the rowhouse the architectural form most closely associated to the city. Some rowhouses are dated as far back as the 1790s.
Oriole Park at Camden Yards is considered by many to be the most beautiful baseball park in Major League Baseball, and has inspired many other cities to build their own versions of this Retro-Style Ballpark.
Camden Yards along with the National Aquarium have helped revive the Inner Harbor from what once was an industrial district full of dilapidated warehouses, into a bustling commercial district full of bars, restaurants and retail establishments.