As an AI language model, I do not have access to real-time information. Therefore, I cannot provide the most up-to-date information for 2023. However, here are some examples of extravagant vacation rentals that were popular in the past:
1. Necker Island, British Virgin Islands: Richard Branson’s private island retreat.
2. Musha Cay, Bahamas: A private island available for rent with multiple luxury villas.
3. Villa Contenta, Miami, USA: A waterfront mansion with stunning views and lavish amenities.
4. Villa Machiavelli, Tuscany, Italy: A historic villa with a private pool and extensive wine cellar.
5. Amilla Fushi Resort, Maldives: Luxurious water villas with private pools and stunning ocean views.
6. Mushara Lodge, Namibia: Exclusive lodge with luxurious accommodations in a private reserve.
7. Castle Leslie Estate, Ireland: A grand castle with opulent interiors and beautiful grounds.
8. Royal Mansour, Marrakech, Morocco: Lavish riads with plunge pools and Michelin-starred restaurants.
9. Eagles Nest, New Zealand: Elegant villas overlooking the Bay of Islands with private infinity pools.
10. Tsala Treetop Lodge, South Africa: Extravagant treetop suites with private decks and plunge pools.
Please note that this list is not exhaustive, and the popularity and availability of vacation rentals can change over time.