• The National Army Museum opens today following a massive three year, almost £24 million redevelopment. Designed by architects BDP and exhibition design agency Event (with £11.5 million in funding from The National Lottery), the main site of the museum at Chelsea features five new permanent galleries and a temporary exhibition space. Laid out over four floors, the new galleries feature more than 2,500 objects arranged under the themes of ‘Soldier’, ‘Army’, ‘Battle’, ‘Society’ and ‘Insight’. Among the objects on display are Crimean Tom, a cat found during the Crimean War and brought back as a pet (‘Soldier’), a portrait of Khudadad Khan VC, the first Indian soldier to win the Victoria Cross (‘Army’), the famous ‘Siborne Model’ of the Battle of Waterloo (‘Battle’), the flak jacket, helmet, identity discs and press pass of journalist Kate Adie (‘Society’), and a cup from the 1745 Jacobite Rebellion (‘Insight’). The new 500 square metre temporary exhibition space, meanwhile, is initially hosting the exhibition War Paint: Brushes with Conflict which features more than 130 paintings and objects explores the complex relationship between war and the men and women who map, record, celebrate and document it. Other features at the museum include a new cafe, shop and play area for children known as Play Base. Entry to the museum is free. For more, see www.nam.ac.uk.

• Butterflies return to the Natural History Museum this week with the immersive exhibition, Sensational Butterflies. The experience, now in its ninth year, takes visitors on a trail through a tropical habitat as they encounter each aspect of the life-cycle of the butterfly with highlights including watching them hatch from delicate chrysalises and seeing them feed and engage with each other. The Butterfly House team will be on hand to answer questions and give advice and tips. Admission charge applies. Runs from Friday until 17th September. For more, see www.nhm.ac.uk/sensational-butterflies.

A new exhibition exploring the personal stories of those who fought in World War I as well as those back home opens at the Guildhall Art Gallery tomorrow. Echoes Across The Century, conceived and delivered by the Livery Schools Link in partnership with the gallery, takes visitors on a “multi-sensory journey” exploring craftsmanship, memory and separation. It features Jan Churchill’s installation, Degrees of Separation, and the work of 240 students who were guided and inspired by Jane as they explored the impact of the war and imagined what life was like for those 100 years ago. Admission is free. Runs until 16th July. For more follow this link.

Send all items for inclusion to exploringlondon@gmail.com