Titan Arum, a flowering plant that is famous for giving off the smell of a rotting corpse when in flower.... is in flower right now at Kew Gardens.
One of those quite literally Once-In-A-Lifetime opportunities comes to an end in just three months time.
In August there will be a chance to go inside Clarence House, the official residence of The Prince of Wales and The Duchess of Cornwall.
Next month will offer a chance to take a trip down the Thames in a steam powered tug. The steam tug Portwey is one of only two twin screw, coal fired steam tugs now active, and is based in Docklands.
There's a tall brick tower that dominates the area next to the Thames at Kew Bridge, and later this month is a rare chance to climb it.
In August there is an event called Kids Week that offers free tickets to children to go to the theatre. Despite its name, it appears to last all month.
A series of WW2 tunnels under Clapham that were later used as a short term hotel for Windrush arrivals are being opened up for tours.
A mini-Highline is a step closer to be being built in Peckham following the completion of the crowdfunded feasibility process.
This weekend, the Epping Ongar heritage railway, at the end of the Central line, will be hosting a grand total of five steam trains chugging decoratively through the Essex countryside.
To mark 200 years since the House of Commons Library appointed its first Librarian, and the first ever 'National Democracy Week', the Library is open for tours on Saturday 7 July.