This massive 21,084 square foot mansion is located at 11018 Glend Road South and was just listed a day ago. It is listed at $4,999,500, which is a very good price at $237 per square foot, and contains a surprising 9 bedrooms and 12 bathrooms! It also has a great room, a solarium, a library, a family room, an indoor pool, a tennis court, and an 8,000 square foot lower level. (which is included in the square footage)

This 7 bedroom, 9 bathroom mansion is located at 10214 Iron Gate Road in Potomac, MD. It is listed at $7,800,000, which is pretty expensive considering its size and location. It contains an amazing 2-story foyer with huge crystal chandelier and unique staircase, and a swimming pool with pool house.