Fort Union National Monument is a historic site that served as a military fort during the 19th century. One of the most interesting points of interest at this park is the 3rd Fort Union, which was constructed in the late 1860s. The fort played a significant role in protecting the Santa Fe Trail and served as a center for trade and commerce in the region.

There are several good reasons to visit the 3rd Fort Union. For history enthusiasts, it is a chance to step back in time and explore the remnants of a bygone era. The fort has been well-preserved, and visitors can see the barracks, officers' quarters, and other structures that were vital to the fort's operation.

In addition to its historical significance, the 3rd Fort Union also boasts some unique features. One of the most interesting is the "star fort" design, which was an innovative approach to fort construction at the time. The fort also has a number of underground tunnels and chambers, which were used for storage and defense purposes.

Overall, the 3rd Fort Union is a must-see attraction for anyone visiting Fort Union National Monument. It offers a fascinating glimpse into the history of the American West and is sure to leave a lasting impression on visitors of all ages.