You could study our nation's rich history for a lifetime and still have more to learn. If that seems like a bit of a commitment, consider spending a day weaving through historical structures and discovering keys to our past with CitySights DC.
• $20 ($35 value) for one 24-hour ticket for the Monuments Express tour
• Buses take off between 9 a.m. and 5 p.m. -- hop on and off anywhere on the line
• The red loop will take you to the District's most famous monuments and landmarks -- like the White House