The Green Man is one of architecture's most enduring mysteries — a carved face, wreathed in foliage, that appears in buildings across centuries and continents, from medieval European cathedrals to Roman temples to Victorian manor homes. Nobody fully agrees on what it means.

Lang carved one into the fireplace mantle of the Victorian Parlor — an unusual choice for a Denver drawing room, and one that speaks to his sophisticated understanding of architectural symbolism. The Green Man is associated with the cycles of nature, with what grows and returns, with the wildness that exists just beneath the surface of civilized things.

In a city built on silver and speed, in a room where Denver's most powerful families gathered for their most important conversations, Lang placed a face that suggested the natural world was watching.

The Green Man is still there. Look for it when you visit the parlor.

The stained glass peacock window is the jewel of the castle's interior — a riot of color and craft that filters light differently at every hour of the day. In the Victorian era, the peacock was the ultimate symbol of wealth, beauty, and ambition. To commission a peacock window for your home was a statement: we have arrived, and we intend to stay.

Lang understood his clients. Denver's silver barons weren't building homes — they were building monuments to a particular moment in American history, when a landlocked mountain city briefly became one of the wealthiest places on earth. The peacock window captures that perfectly: extravagant, gorgeous, unapologetically proud.

The silver boom ended. The fortunes faded. The window is still here, still throwing its colored light across the same floors it illuminated in 1889.

The window faces east — the morning light through it is something guests mention repeatedly.

Rhyolite is a fine-grained volcanic rock, formed from ancient lava flows in the Colorado foothills. Lang specified it for the Marne's exterior — and the choice was deliberate. Rhyolite absorbs heat during the day and releases it slowly through the evening, giving the castle's exterior walls a warmth that guests notice when they touch them in late afternoon.

The exterior carving on this building is extraordinary — hand-cut details that no modern construction budget would allow. Look at the facade from the private balconies and you'll see why guests tell us they spend longer studying it than they expected. Every surface has a decision behind it.

When the castle was designated a National Historic Landmark, the carved Rhyolite stonework was among the specific features cited. It is, by any measure, among the finest examples of its kind in Denver.

The Rhyolite facade is best viewed from the Crestone or Durango suite balconies at golden hour.

Victorian turrets are often dismissed as architectural showmanship — and in some cases, that's fair. But Lang was too practical an architect for pure decoration. The Marne's turret was positioned to catch the prevailing summer breeze from the mountains, drawing cooler air through the upper floors of the house in an era before mechanical cooling existed.

The turret alcove in the Crestone Suite — the window seat that guests now use for morning coffee and reading — was originally a cool refuge during Denver's hottest months. The original owners of this house understood passive climate control in ways that modern architecture is only now rediscovering.

The turret is still the coolest corner of the castle on a warm Denver afternoon.

There are roughly 2,600 National Historic Landmarks in the United States. The designation requires a property to meet extraordinarily high standards — it must possess "exceptional value or quality in illustrating or interpreting the heritage of the United States." It is a higher bar than the National Register of Historic Places, and only a fraction of registered properties ever achieve it.

Castle Marne earned the designation in part for its architectural significance — the carved stonework, the turret, the peacock window, the Crestone Suite's balcony were all specifically cited. But the social history matters too: a building that housed one of the most important suffragists in American history, during the years she was doing her most consequential work, has a claim on the national story that goes beyond its facade.

For guests, the designation means something practical: the castle cannot be substantially altered, which means what you see today is as close to what William Lang built in 1889 as it is possible to get. You are not staying in a building that once had history. You are staying in the history itself.

In 1889, Denver was riding the silver boom at full gallop. Colorado's mines were producing staggering quantities of silver, and the fortunes flowing out of them were concentrating in Capitol Hill, the neighborhood where this castle stands. Denver's population had doubled in a decade. The city had electric lights, cable cars, and grand opera. It felt, briefly, like the future.

The Gilded Age mansions of Capitol Hill — of which Castle Marne is among the finest surviving examples — were built by men who fully believed they were establishing a permanent aristocracy. They were wrong about the permanence. The silver crash of 1893 wiped out many of them within years of completing their palaces.

What they left behind is the neighborhood you walk through today: one of the most architecturally intact Victorian streetscapes in America, anchored by a castle that has now outlasted the fortunes, the booms, and the busts by 135 years — and is still standing, still taking guests, still making history.

The silver crash of 1893 happened the same year Sarah Platt Decker helped win Colorado women the vote. History is rarely tidy.