Traverse London in regal comfort at a 4-star, historic mansion in the heart of London's exclusive Mayfair neighborhood -- saving more than 50% on current prices.

For $155 (£99) per night, check in any day Aug. 13 - Oct. 31 and receive a welcome glass of prosecco per person. Guests also receive a 20% discount on the hotel's Michelin Guide-recommended restaurant.

Upgrade the offer to include breakfast for $166 (£107) per night.

The stylish Millennium Hotel London Mayfair is set within an 18th-century Georgian mansion, which was built as a stately townhouse and overlooks fashionable Grosvenor Square. Nearby attractions include Green Park, Buckingham Palace and the shops and boutiques of Oxford Street, with the Bond Street Tube station a five-minute walk from the hotel.

Note: Prices will appear in British pounds. Reservations are advanced purchase and nonrefundable.

Travelzoo Tip: From July 31 - Oct. 7, Buckingham Palace will open its doors for tours and a special exhibit on the royal diamonds.