Great Britain (Universal Mail) Blenheim Palace, Hampton Court Palace, Tower of London, Royal Yacht, XT 500

Great Britain stamp 

Universal Mail (they produce tourist  related stamps)

Blenheim Palace, XT 500

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Blenheim Palace is a monumental country house situated in Woodstock, Oxfordshire, England, residence of the dukes of Marlborough. It is the only non-royal non-episcopal country house in England to hold the title of palace. The palace, one of England's largest houses, was built between 1705 and circa 1722. Blenheim Palace was designated a UNESCO World Heritage Site in 1987.

Great Britain stamp 

Universal Mail 

Hampton Court Palace, XT 500

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Hampton court palace is a royal palace in the London Borough of Richmond upon Thames, Greater London. 

Today, the palace is open to the public and is a major tourist attraction.

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Great Britain stamp 

Universal Mail 

Tower of London, XT 500

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Great Britain stamp (Universal Mail) 

Royal Yacht Britannia, XT 500

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Her Majesty's Yacht Britannia is the former royal yacht of the British monarch, Queen Elizabeth II, in service from 1954 to 1997.  Today, she is a museum ship in Edinburgh, Scotland.