Over the years, the Castle has been home to the Smithsonian Institution Archives and the Woodrow Wilson International Center for Scholars. Today, the Castle houses the Institution's administrative offices and the Smithsonian Information Center.
Withdrawals made after age 59 and 1/2 are normal retirement withdrawals and are not taxed. You paid tax on that income when you first contributed to the Roth IRA. If the withdrawal is made before age 59 and 1/2 and is only up to the amount that has been contributed to the Roth IRA then no income tax is charged. Withdrawals of contributions are tax-free.
Individuals may contribute money to a Roth IRA from January 1 of the current tax year to April 15 of the following tax year (in 2018, the date is April 17). Contributions are made with post-tax dollars. You pay tax today so that no tax is charged to you for withdrawals you make in retirement.