Mar A Lago and Area 51 are special bonus boards tied to specific cities:

• Mar A Lago — accessed from the West Palm Beach board.
• Area 51 — accessed from the Las Vegas board.

Invitations to these bonus boards can be delivered by the Billionaires Wheel, which mails the invitation to your Mailbox tile. You then have 10 minutes to land on the Mailbox to accept the invitation; otherwise it expires.