Hotels chase the 'est' factor

Records were made to be broken and hotels the world over are pushing the boundaries to claim an 'est' title. From the tallest to the largest, the greenest to the priciest, these holders have set high standards for hotel stays. Hotels.com lists the world's 'est' title hotels:
The world's tallest hotel:
THE RITZ-CARLTON HONG KONG, 5-STAR
Destination: Hong Kong
Not for the faint-hearted or those scared of heights, the newly opened Ritz-Carlton Hong Kong towers 490m above ground and operates from the 102nd to the 118th floor of the International Commerce Centre. Taking the title of the tallest hotel in the world off the Rose Tower in Dubai, the Ritz aims to take luxury to new heights. The hotel delivers guests first-class views of the spectacular city skyline and luxury service to match. Guests can enjoy a drink from the world's highest rooftop bar, Ozone, and, for those seeking relaxation and pampering, the
Ritz-Carlton Spa offers an exclusive range of treatments that will provide guests with the opportunity to relax, renew and rejuvenate mind, body and soul.
Rates at the Ritz-Carlton Hong Kong start at $690 a room for one night*.
The world's largest hotel:

IZMAILOVO HOTEL GAMMA DELTA, IZMAILOVO HOTEL COMPLEX, 3-STAR:
Destination: Moscow, Russian Federation
Size matters when it comes to setting records and, with 7500 rooms, the enormous Izmailovo Hotel Complex in Moscow claims the title of being the world's largest hotel. This huge structure, which can accommodate more than 10,000 guests, is made up of four 30-storey buildings. The Izmailovo Hotel Gamma Delta offers guests a full-service spa, health club and bowling alley as well as a wide choice of bars, cafes, restaurants and a nightclub.
Rooms at the Izmailovo Hotel Gamma-Delta start at $108 a room for a night*.
The world's priciest hotel suite:
THE ROYAL PENTHOUSE SUITE, HOTEL PRESIDENT WILSON, 5-STAR:
Destination: Geneva, Switzerland
Built for the ridiculously rich and famous and priced at a nightly rate of $80,000 (breakfast not included), the royal penthouse suite at the Hotel President Wilson wins the title for the world's priciest hotel suite. Covering the entire top floor of the hotel, this beyond-extravagant suite boasts 12 rooms, 12 bathrooms and a private fitness centre. With a view that overlooks the city, Lake Geneva and Mont Blanc, the Hotel President Wilson has played host to many a celebrity and because it is very close to the United Nations headquarters, it has accommodated many heads of state.
Rooms at the Hotel President Wilson start at $691 a room for one night*.
The world's greenest hotel:

THE CROWNE PLAZA COPENHAGEN TOWERS, 4-STAR:
Destination: Copenhagen, Denmark

Attracting eco-conscious travellers from throughout the world, the Crowne Plaza Copenhagen Towers in Denmark holds the Skal International EcoTourism award for the world's greenest hotel. Featuring the largest building-integrated solar panels in northern Europe and Denmark's first groundwater-based heating and cooling system, the Crowne Plaza Copenhagen Towers is the only carbon-neutral hotel building in Denmark. It is estimated to save 1.4 tonnes in carbon emissions a year. The climate-friendly features include low-energy TVs, widespread water conservation practices and biodegradable shampoo bottles, toothbrushes and shower caps.
Rooms at the Crowne Plaza Copenhagen Towers start at $191 a room a night*.

The world's coldest hotel:
ICEHOTEL, 3-STAR:
Destination: Jukkasjarvi, Sweden
Travellers planning to stay at the Icehotel better pack their thermals. And be prepared for an icy reception literally. This property offers the ultimate winter wonderland, with rooms built entirely out of ice. Built from scratch every winter, this hotel features 60 rooms with temperatures ranging from -5C and -8C. Travellers worried about the freezing temperatures should fear not as the hotel provides reindeer skins and sleeping bags to keep guests warm throughout the night.
Rooms at the Icehotel start at $182 a room for one night*.
*Offers and example prices are inclusive of fees and taxes, subject to availability and change, and are valid as at June 9, 2011, for a limited time only and conditions apply.