The most expensive piece of residential real estate on the market in America is a plot of vacant land. That's right, this 9.4-acre waterfront spread in Amagansett, N.Y. is listed for a whopping $200M, without a single structure to show for it.

The former home of fashion designer Gianni Versace and the site of his tragic murder, Casa Casuarina was once an apartment building and was transformed into a hotel after Versace's death. Now marketed as a private home, the sprawling villa still bears the marks of the designer's extravagant renovations.

Few have ever resisted price chops as much as philanthropist Suzanne Saperstein, whose Holmby Hills estate has been listed for $125M for years without selling. Known as Fleur de Lys, the megamansion has 12 bedrooms, 15 bathrooms, a ballroom, two kitchens, a 50-seat screening room, marble walls, limestone floors, and a nine car garage, among other virtues.

It might not be NYC's most desirable building, but Midtown West's CitySpire is home to the most expensive penthouse on the market in the city. The 8,000-square-foot apartment has 360-degree views of the city, along with 3,000-square-feet of terraces, six bedrooms, nine bathrooms, and some half-baked rich guy decor.

The Beverly House, as this property is known, was once the home of publishing tycoon William Randolph Hearst and actress Marion Davies. Set on 3.7 acres just north of Sunset Boulevard, the mansion hosted JFK and Jackie's honeymoon, was a set in "The Godfather," and, oh yeah, it's 50,000 square feet.

Liberty Travel co-founder Gilbert Haroche listed this 7,000-square-foot full-floor apartment in the Sherry-Netherland Hotel for $95M, but it's actually the second property he has listed for that sum. Previously, his country estate in Connecticut was listed for $95M.

This 266-acre plot on the south shore of Martha's Vineyard is set to smash island records if it sells for anything close to the asking price. Surrounded by nearly 1,000 acres of conservation land, this undeveloped property would make for one of the most private estates on the East Coast.

Businessman Gabriel Brener, owner of the Houston Dynamo soccer team, built this sprawling megamansion on the site of Walt Disney's last home (and the entertainment guru's extravagant train set.) The 3.7-acre estate includes "eight-bedroom, 17-bathroom main house, a wine cellar, a pool house, a tennis court, a putting green, a screening room, three bars, a library, a gym, three inch thick mahogany doors, and two safe rooms."

Perhaps the most famous house in the country at the moment, the Floridian version of Versailles under (slow) construction outside of Orlando is asking a whopping $90M complete, $65M in its current state.

Despite the ominous name, the 92-acre Flood Estate actually takes its title from mining magnate James Flood, and not from any potential for watery damage. Now located not far from the heart of Silicon Valley, the massive estate and its 9,000-square-foot mansion are sure to attract the attention of a tech billionaire.

The 2,190-acre Rancho Dos Pueblos, part of an original Spanish land grant, is assuredly one of the largest oceanfront parcels available on the West Coast. In addition to the large amount of land, the property boasts 13 structures, including the five-bedroom "Casa Grande."

Another super expensive plot of vacant land, this 11.21-acre, Ocean-to-Intracoastal estate could probably hold an entire resort, but it's being marketed to deep-pocketed private buyers as well.

It turns out Donald G. Abbey doesn't have just one, but two near-$80M estates currently listed on the market. This one, a private island on of the "cleanest lakes in the world" holds what is currently Montana's largest house, at 32,000 square feet.

A labor of love commissioned in 2000 by Tommy Hilfiger co-founder Joel Horowitz, this 20,000-square-foot lakefront estate was chopped down from its initial $100M ask.

The most expensive mansion currently listed in always-pricey Palm Beach, this 27,000-square-foot spread has been holding fast at $74M for close to a year now.