1. The 1783 Treaties of Portsmouth were signed on August 25, marking the end of the Revolutionary War and the beginning of friendly relations between the United States and Great Britain. The treaties were negotiated by John Adams, Benjamin Franklin, and John Jay in Portsmouth, New Hampshire.

2. On August 25, 1928, the first NH state forest was established in Wales. The 2,085-acre forest was created to protect the land from logging and preserve its ecological integrity.

3. In 1960, on August 25, the iconic Mt. Washington cog railway celebrated its 100th anniversary as the world's first mountain-climbing cog railway. The railway, which still operates today, offers stunning views of the White Mountains of New Hampshire.

4. On this day in 1990, the Mount Washington Observatory recorded one of the highest wind speeds ever recorded on Earth - 231 mph. The observatory sits at the summit of Mount Washington, which is known for its extreme weather conditions.

5. August 25, 2000, marked the opening of the New Hampshire International Speedway in Loudon. The speedway attracts thousands of visitors each year to watch NASCAR races and other motorsports events.