The White House

Also known as 1600 Pennsylvania Avenue, the home of the POTUS is probably one of the most secure places in the world. Completed in 1800, this has been the home of every U.S. president since POTUS#2, John Adams. Designed by Irish-born James Hoban, it was largely influenced by Leinster House in Dublin. Even the home of the leader of the Free World is open to U.S. citizens as long as requests are submitted through one's Member of Congress no less than 21 days in advance.