The original structure was built about 1897 and expanded in several stages.

The structure was not expanded much by these works.

In time, the structure can be expanded northward by an additional 20,000 square feet.

In the following decades, the structures of the fort have been expanded and strengthened.

The original structure was built about 1720 and expanded in the 1780s.

The original structure was expanded during the 19th and early 20th centuries to its present size.

The structure was expanded from four to five stories in 1895.

In 1939, the structure was expanded to hold 45,000 people.

Each structure has also been expanded over the years.